To find near doubles.

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Presentation transcript:

To find near doubles

First try these: 10+10= 20 16 8+8= 5+5= 10 14 7+7=

Now try these: 15+15= 30 12 6+6= 12+12= 24 20+20= 40

If 7+7= 14 What would 7+8 be? 15 What would 7+6 be? 13

If 5+5= 10 What would 5+6 be? 11 What would 4+5 be? 9

If 12+12= 24 What would 12+11 be? 23 What would 12+13 be? 25

If 15+15= 30 What would 15+16 be? 31 What would 14+15 be? 29

If 12+12= 24 What would 12+11 be? 23 What would 12+13 be? 25

If 32+32= 64 What would 32+33 be? 65 What would 31+33 be? 64

If 20+20= 40 What would 19+20 be? 39 What would 19+21 be? 40

Which double number would help? 21+19 Which double number would help? 20+20= 40 21+19= 40 41 22+19=

Which double number would help? 61+59 Which double number would help? 60+60= 120 61+59= 120 63+59= 122