Adding Tens

1. 57 + 65  = 122 4. 44 + 66 = 101

5 + 6 = 11 4 + 6 = 10

50 + 50 = 100 40 + 60 = 100

2. 68 + 36 =109 5. 34 + 55  = 89

8 + 6 = 14 4 + 5 = 9

60 + 30 = 109 30 + 50 = 80

3. 44 + 69 =113 6. 48 + 24 =72

4 + 9 = 13 8 + 4 = 12

40 + 60 = 100 40 + 20 = 60

84 + 62 =106

4 + 2 = 6

80 + 20 = 100

I solve my maths by adding 10s and I use the strategy. And thats how I get my maths done quick.