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Published byDamon Greer Modified over 7 years ago

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Objectives: Subtract pairs of two‐digit numbers by counting back or counting up; Choose when to use each strategy with simple calculations. © Hamilton Trust Stepping Up Term 1 Week 3 Day 3

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When is it easier to subtract by counting back? 76 – 21 84 – 32 58 – 34 84 - 30 is 54, then -2 = 52 76 - 20 = 56, then -1 = 55 58 - 30 is 28, then -4 = 24

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© Hamilton Trust Stepping Up Term 1 Week 3 Day 3 Lets do a few together… Subtract 33 from each of these 2-digit numbers:

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© Hamilton Trust Stepping Up Term 1 Week 3 Day 3 Have you got it? Count back to subtract 21 from the splatted numbers. Do as many as you can in 1 minute!

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© Hamilton Trust Stepping Up Term 1 Week 3 Day 3 So, would you use counting up or counting back to solve these subtractions…? 42 – 38 56 – 31 85 – 23 83 – 55 79 – 46 52 – 29 count up count back

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© Hamilton Trust Stepping Up Term 1 Week 3 Day 3 It’s no different when using 3-digit numbers… 102 – 97 304 – 297 356 – 201 434 – 220 203 – 189

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The white cell shows the difference between the blue and red numbers. Copy and complete one of the grids, choosing to use counting up or counting back for each subtraction. © Hamilton Trust Stepping Up Term 1 Week 3 Day 3 - 35491424 7965 92 68 53 - 1352821443 59 192 77 353310

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