Year Multiplication Foundatio n stage Children start by counting on in 2’s and 10’s. They also practise doubling and grouping numbers which is then linked to problem solving e.g. how many pieces of bread to make 5 sandwiches. To support children, teachers will use lots of physical equipment such as numicon, cubes, counters, natural resources and other objects that the children can practise grouping and doubling. This is particularly important in Key Stage 1 as pencil and paper procedures only develop once the links are made in children’s understanding. Year 1 Children learn to multiply using concrete objects, numicon, pictorial representations and arrays with the support of the teacher. Making sets: 3 x 5 Leading to: + Year 2 (‘3 sets of 5’ or ‘3 lots of 5’) + = 15 Children in Year 2 continue with hands on maths based around grouping, doubling but start to use informal pencil and paper procedures, particularly a number line. Children learn to recognise that multiplication is repeated addition. They also begin to use arrays. Number Line: Additional notes to support teaching and learning Teaching video demonstrating how multiplication can be demonstrated in different ways https://www.ncetm.org.uk/r esources/40530 Multiplication should be taught as being the same as repeated addition. Children should learn that multiplication of two numbers can be done in any order (commutative). Teaching video available at: https://www.ncetm.org.uk/r esources/40530 Use number lines with divisions before empty number lines. Repeated Addition: 5 + 5 + 5 = 3 lots of 5 = 3 x 5 = 1 Arrays: Multiplication should be taught as being the same as repeated addition. Year 3 Children in year 3 learn to write and calculate mathematical statements for multiplication using the multiplication tables that they know, including for two-digit numbers times onedigit numbers, using mental and progressing to formal written methods Children should know that multiplication of two numbers can be done in any order (commutative). Teaching video available at: https://www.ncetm.org.uk/r esources/40530 Partitioning: = 13 x 5 = (10 x 5) + (3 x 5) = 50 + 15 = 65 Year 4 In year 4 children learn to multiply two-digit and three-digit numbers by a one-digit number using a formal written layout. Both the grid method and the expanded vertical method are taught side by side. Video demonstrating use of grid method https://www.ncetm.org.uk/r esources/40530 Process Steps to Success – Grid Multiplication (2-digit x 1digit) 1. Estimate the answer first. 2. Create the grid as shown below. 3. put the single digit on the top and partition the 2-digit number down the left hand side. 4. Multiply the numbers down the side with the number on top and fill in the grid. 5. Add together the numbers in the grid and check answer against the estimate. Grid and vertical method should be taught alongside each other. Video demonstrating how to link grid method with vertical method https://www.ncetm.org.uk/r esources/40530 Process Steps to Success – Grid Multiplication (2-digit x 2digit) 1. Start as for 1-digit but partition both numbers. 2. Multiply the numbers down the side with the number on the top and fill in the grid. 3. Add together each row and create a vertical addition sum to the right. 4. Complete the addition sum. 2-digit x 1-digit: X 5 10 50 3 15+ 65 2-digit x 1-digit: X 30 8 10 300 80 = 380 7 210 56 = 266 + 646 1 Process Steps to Success – Expanded Vertical Multiplication 1. Estimate the answer first. 2. Line the numbers up vertically as shown below. 3. Take the bottom right digit and multiply it by both the top digits. 4. Write the calculation you have done and put it in brackets to the side. 5. (2-digit x 2-digit) repeat with the number on the bottom left. 6. Add together the numbers to get the answer and check against the estimate. 2-digit x 1-digit: 13 5 x 5 0 (5 x 3) 1 5 (5 x 10) 65 Note, once children have mastered the concept of this method, they can stop putting the numbers in brackets. 2-digit x 2-digit: 38 17 x 56 210 80 (7 x 8) (7 x 30) (10 x 8) 300 646 1 Year 5 (10 x 30) Children in year 5 learn to multiply numbers up to 4 digits by a one- or two-digit number using a formal written method, including long multiplication for two-digit numbers Process Steps to Success – Short Multiplication (TU x U and HTU x U) 1. Estimate the answer first. 2. Set the sum out the same as the vertical expanded method. 3. Start with the bottom right hand number and multiply that with the top right hand number. 4. Put the answer below the line. If it is a 2-digit number then put a small tens digit in the next column. 5. Continue with the bottom right hand number and multiply that with the other digits on the top. 6. Underline the answer and check against the estimate. Video demonstrating how to link grid method with vertical method https://www.ncetm.org.uk/r esources/40530 Process Steps to Success – Short Multiplication (TU x U and HTU x U) 1. When you have completed using the bottom right hand digit, you need to move on to the left hand bottom digit. 2. Before you do any calculations, put in the place holder. 3. Then complete the sum in the same way (2 x 6 and then 2 x 3) 4. Add together the lines to arrive at the answer. HTU x U = 236 4 x 944 1 2 TU x TU = 36 24 x 144 2 7 20 1 864 Year 6 Remember the place holder In year 6 children learn to multiply multi-digit numbers up to 4 digits by a two-digit whole number using the formal written method of long multiplication. Children will also multiply with decimals. Teach alongside grid to reinforce the understanding of place value. 158 x 67 _____ 1106 9480 _____ 10586 Process Steps to Success – Short Multiplication with Decimals 1. Estimate the answer. 2. Put the number with the most digits on the top and the other number below. 3. Forget the decimal places exist for the moment. Complete the sum as you would without the decimals. 4. When you have an answer, identify how many digits were after the decimal place(s) in the original sum. Move the decimal place a corresponding number left. £ 2.3 6 4 x 944 1 2 With the figure of 944, you then check how many digits there are after the decimal place which is 2 digits (.36) so the decimal place is moved two places in the answer to 9.44