Year 5 and 6 Calculations Maths Information Session • Welcome • Multiplication (Grid Method) • Subtraction (Column & Number Line) • Division (Bus Stop, Chunking and Number Line) • Addition (Column) Multiplication • Grid Method Example 16 X 37.4 = • • • • • • • Success Criteria Estimate Draw grid - what size? Partition each number Multiply the numbers Put on correct zeros Add vertical boxes in columns • Check against estimate Multiplication • Now its your turn 1. 2083 X 76 = 2. 9 X 6.34 = 3. 43 X 62 = Subtraction • Column Subtraction Example 1326 – 718.4 = Success Criteria • Put digit in correct column • Line up the decimal point • Write the - sign • Put the decimal point in answer box • Copy numbers correctly • Start at right • Borrow from the left if you need to • Watch out for the zeros! Subtraction • Number Line Example 7005 – 537 = • Ellie and Safaa will explain this method which is useful for money calculations Subtraction • Have a go at these using either of the methods you have been shown. 1. 2. 3. 2008 – 523.8 = 2674 – 837.6 = 689 – 143 = Success Criteria • Put digit in correct column • Line up the decimal point • Write the - sign • Put the decimal point in answer box • Copy numbers correctly • Start at right • Borrow from the left if you need to • Watch out for the zeros! Division • Bus Stop Example 2137 ÷ 7 Division • Chunking Example 977 ÷ 18 = Chunking Success! • Work out multiples of the number you are dividing by • e.g. 10x, 5x, 20x, 30x, • Subtract the largest multiple possible • Record in brackets which multiple you are subtracting • Continue until the remainder is smaller than the number you are dividing by • Add up how many multiples you have subtracted • Record your answer e.g. 78 r9 Division • Number Line Example 170 ÷ 14 = Division • Three examples for you (Think which of the methods you would use to solve them) 1. 2. 3. 380 ÷ 17 = 3788 ÷ 6 = 6912 ÷ 3 = Remember Chunking Success! • Work out multiples of the number you are dividing by • e.g. 10x, 5x, 20x, 30x, • Subtract the largest multiple possible • Record in brackets which multiple you are subtracting • Continue until the remainder is smaller than the number you are dividing by • Add up how many multiples you have subtracted • Record your answer e.g. 78 r9 Addition • Column Addition 1. 4382 + 769 = 2. 29.83 + 147.09 = 3. 9679 + 14823 =