Multiplication and Division Calculation Policy February 2015 MULTIPLICATION AND DIVISION CALCULATION POLICY Children should be confident in using a range of mental calculation strategies (see mental calculation policy) and informal written methods, before they are ready for formal written calculations Mental calculation strategies should continue to be taught alongside formal written methods. At all stages of progression, a child should be able to choose whether a calculation requires a mental or written strategy and what will be most efficient Teaching informal written methods, such as how to use an empty number line, should provide a model for children to develop a mental strategy Teachers should plan to teach calculation strategies and then give a wide range of opportunities for children to apply the strategy in problem solving contexts Times tables should be taught everyday from Year 2 onwards either as part of a mental oral starter or at other times as appropriate within the day National curriculum expectations Year 2 - 2,5,10 times tables Year 3 – 3,4,8 times tables Year 4 – all multiplication and division facts up to 12 x 12 MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 1 Objective from the National Curriculum Ways in which children calculate this solve one-step problems involving multiplication and division, by calculating the answer using concrete objects, pictorial representations and arrays with the support of the teacher. Learning Intentions To be able to count in groups of equal size (eg 2s, 5s and 10s) To be able to represent multiplication as groups of equal size on a number line There are 3 sweets in one bag. How many sweets are there in 5 bags? To be able to solve multiplication problems by representing groups of equal size with pictures To be able to solve multiplication problems by using an array MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 1 Objective from the National Curriculum solve one-step problems involving multiplication and division, by calculating the answer using concrete objects, pictorial representations and arrays with the support of the teacher. Ways in which children calculate this Using pictures and symbols Children should have opportunities through play to understand and experience division in terms of Sharing – ‘one for you, one for me…’ Grouping – ‘let’s put three apples on each plate’ Sharing 6 sweets are shared between 2 people. How many do they have each? Learning Intentions To be able to divide by sharing objects Practical activities involving sharing, distributing cards when playing a game, putting objects onto plates, into cups, hoops etc. Grouping Sorting objects into 2s / 3s/ 4s etc How many pairs of socks are there? There are 12 crocus bulbs. Plant 3 in each pot. How many pots are there? Jo has 12 Lego wheels. How many cars can she make? To be able to divide by grouping objects MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 2 Objective from the National Curriculum Ways in which children calculate this Learning Intentions calculate mathematical statements for multiplication and division within the multiplication tables and write them using the multiplication (×), division (÷) and equals (=) signs show that multiplication of two numbers can be done in any order (commutative) and division of one number by another cannot solve problems involving multiplication and division, using materials, arrays, repeated addition, mental methods, and multiplication and division facts, including problems in context To be able to multiply two numbers by using arrays Looking at columns 2+2+2 3 groups of 2 Looking at rows 3+3 2 groups of 3 5x3=5+5+5 5 0 1 2 5 3 4 5 6 7 5 8 9 10 11 12 13 14 15 To be able to multiply two numbers using repeated addition on a number line To know that multiplication can be done in any order (is communicative) MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 2 Objective from the National Curriculum Ways in which children calculate this calculate mathematical statements for multiplication and division within the multiplication tables and write them using the multiplication (×), division (÷) and equals (=) signs Learning Intentions To be able to divide numbers by repeatedly subtracting on an empty number line show that multiplication of two numbers can be done in any order (commutative) and division of one number by another cannot solve problems involving multiplication and division, using materials, arrays, repeated addition, mental methods, and multiplication and division facts, including problems in context To be able to divide using arrays 6÷2=3 6÷3=2 Practical grouping e.g. in PE 12 children get into teams of 4 to play a game. How many teams are there? To know that division cannot be done in any order (is not communicative) MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 3 Objective from the National Curriculum Ways in which children calculate this 26 x 3 = write and calculate mathematical statements for multiplication and division using the multiplication tables that they know, including for two-digit numbers times onedigit numbers, using mental and progressing to formal written methods solve problems, including missing number problems, involving multiplication and division, including integer scaling problems and correspondence problems in which n objects are connected to m objects 20 x 3 = 60 Learning Intentions To be able to multiply two digit numbers by partitioning 6 x 3 = 18 60 + 18 = 78 To be able to use grid method to multiply To be able to find the value of a missing box in multiplication and division by using the inverse * integer scaling problems eg 4 times as high, 8 times as long, 3 times as old * correspondence problems eg 3 hats and 4 coats how many different outfits; 12 sweets shared equally between four children; 4 cakes shared equally between 8 children MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 3 Objective from the National Curriculum Ways in which children calculate this Learning Intentions To be able to divide on a number line by repeated subtraction (counting back) write and calculate mathematical statements for multiplication and division using the multiplication tables that they know, including for two-digit numbers times one-digit numbers, using mental and progressing to formal written methods solve problems, including missing number problems, involving multiplication and division, including integer scaling problems and correspondence problems in which n objects are connected to m objects To be able to divide on a number line by repeated addition (counting on) 72 ÷ 5 = 14r2 10 groups 2 groups 2 groups r2 72 To be able to divide on a number line by counting on in multiples of tens and ones MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 4 Objective from the National Curriculum Ways in which children calculate this multiply two-digit and three-digit numbers by a one-digit number using formal written layout Learning Intentions To be able to multiply two numbers using the grid method (TU x U) solve problems involving multiplying and adding, including using the distributive law to multiply two digit numbers by one digit, integer scaling problems and harder correspondence problems such as n objects are connected to m objects. To be able to multiply two numbers using the grid method (HTU x U) 2 4 x 6 24 120 144 2 4 x 6 144 2 To be able to use expanded short multiplication to multiply two numbers (TU x U) To be able to use short multiplication to multiply two numbers (TU x U) MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 4 Objective from the National Curriculum Ways in which children calculate this 192 ÷ 6 = 32 solve problems involving multiplying and adding, including using the distributive law to multiply two digit numbers by one digit, integer scaling problems and harder correspondence problems such as n objects are connected to m objects. Learning Intentions To be able to use chunking for division To be able to use the short method for division MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 5 Objective from the National Curriculum multiply numbers up to 4 digits by a oneor two-digit number using a formal written method, including long multiplication for two-digit numbers Ways in which children calculate this 24 Learning Intentions To be able to use expanded long multiplication to multiply two numbers (TU x U) x 16 24 120 40 200 384 2 24 To be able to use long multiplication to multiply two numbers (TU x U) x 16 144 240 384 To be able to multiply decimals numbers using the grid method MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 5 Objective from the National Curriculum Ways in which children calculate this divide numbers up to 4 digits by a onedigit number using the formal written method of short division and interpret remainders appropriately for the context Learning Intentions To be able to use the short method for division with remainders To be able to use the short method for division, expressing the remainder as a fraction (remainder as numerator, divisor as denominator, simplify where possible) MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 6 Objective from the National Curriculum multiply multi-digit numbers up to 4 digits by a two-digit whole number using the formal written method of long multiplication Ways in which children calculate this 2435 x 16 14 610 24350 38960 Learning Intentions To be able to use long multiplication to multiply two numbers (ThHTU x TU) MULTIPLICATION AND DIVISION CALCULATION POLICY Stage 6 Objective from the National Curriculum divide numbers up to 4 digits by a two-digit whole number using the formal written method of long division, and interpret remainders as whole number remainders, fractions, or by rounding, as appropriate for the context Ways in which children calculate this Learning Intentions To be able to divide using long division (ThHTU ÷ TU)