Don't Subtract Add

Don’t Subtract, Add (2) We are learning that problems like 34 + ___ = 51 and  51 — 43 = ___ have the same answers.

I had $83 and spent $58 on a book. How much was left? 58+2=60

60+20=80

80+3=83

58+25=83 so 83-58=25✓

There were 63 people on the bus and 27 got off. How many were left on the bus?

27+3= 30

30+30=60

60+3=63

27+36= 63 so 63-27=36✓

92 eggs were laid by the hens. By the afternoon 48 had hatched into chickens. How many eggs had not hatched?

48+2=50

50=40=90

90+2=92

48+44=92 so 92-48=44✓

Write number stories for these equations to show your understanding then solve each one using the ‘Don’t subtract, add’ strategy

1. 81-78 Henry came to school with 81 sausages and Andre ate 78 how many were left? 3 ✓

2. 23-18 There were 23 tongans and 18 of them were gay how many were straight ? 5 ✓

3. 73-28 There was a fight 73 people involved and 28 got knock out  how many were still standing? 45 ✓

4. 93-58 There were 93 rugby players trailing to play for nz only 58 of them got pick how many rugby player didn't make it? 35 ✓

5. 103-88 103 hunters went to find tigres and 88 died how many survived ? 15 ✓

6. 64-38 There were 64 monkeys on a tree 38 fell out how many were still on the tree? 36 ✓