| Written calculations: multiplication - Maths - 15/8/2008
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It is important that children develop mental recall of multiplication tables and associated division facts. By Year 2 they should know by heart facts for the 2 and 10 multiplication tables. By Year 3 they should know by heart facts for the 2,5 and 10 multiplication tables. By Year 4 they should know by heart facts for the 2, 3, 4, 5 and 10 multiplication tables. Progress to 2 digit numbers x by a single digit number through partitioning: 23 x 6 = (20 x 6) + (3 x 6) = 120 + 18 = 138 Leading to the grid method of recording: 23 x 6 X 20 3 6 120 8 120 + 18 = 138 And larger numbers: 23 x 36 X 20 3 30 600 90 6 120 8 600 + 120 = 720 90 + 18 = 108 720 + 108 = 828 142 x 25 X 100 40 2 20 2000 800 40 5 500 200 10 = 2000 + 1500 + 50 = 3550 Leading to compact reading: |
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