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Objectives: • Use halving two or three times to divide by 4 or 8 • Divide by 5 by dividing by 10 and doubling © Hamilton Trust Keeping Up Term 2 Week 5 Day 3 What is the efficient mental strategy for calculating 124 ÷ 4? 120 4 Half of 120 is 60 Half again = 30 Half of 4 is 2 Half again = 1 124 ÷ 4 = 30 + 1 = 31 © Hamilton Trust Keeping Up Term 2 Week 5 Day 3 Use this strategy to find 248 ÷ 4 8 240 Half of 240 is ____ Half again = ____ Half of 8 is __ Half again = __ 248 ÷ 4 = ___ + __ = © Hamilton Trust Keeping Up Term 2 Week 5 Day 3 Have a go at these two problems: 364 ÷ 4 How will you partition 752? © Hamilton Trust 752 ÷ 4 Keeping Up Term 2 Week 5 Day 3 Divide by 8 by halving three times 200 ÷ 8 … 200 half 100 25 50 half again half again 200 ÷ 8 = 25 © Hamilton Trust Keeping Up Term 2 Week 5 Day 3 Choose two of these calculations to solve by halving three times: 864 ÷ 8 128 ÷ 8 720 ÷ 8 © Hamilton Trust Keeping Up Term 2 352 ÷ 8 Week 5 Day 3 Another division trick… for dividing by 5 80 ÷ 5 80 ÷ 10 = 8 but dividing by 10 is twice as much dividing as dividing by 5! So make up for it by doubling the answer… 8 x 2 = 16 Check: 0 © Hamilton Trust 80 ÷ 5 = 16 10 x 5 6x5 50 Keeping Up Term 2 80 Week 5 Day 3 These get trickier… How far can you get? Divide by 5 110 360 265 345 725 ÷ 10 ×2 Check your answers using multiplication. © Hamilton Trust Keeping Up Term 2 Week 5 Day 3