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.