UNIT 03 // SESSION B // MASTER WHEN READY
Add ten first, then take back
Name:Date:
1Follow the example.
47 + 8 → 47 + 10 = 57 → take back 2 → 55
38 + 9 → 38 + 10 = → take back →
56 + 8 → 56 + 10 = → take back →
64 + 9 → 64 + 10 = → take back →
45 + 7 → 45 + 10 = → take back →
2The other route: jump to the next ten first.
47 + 8 → 47 + 3 = 50 → 50 + 5 = 55
38 + 9 → 38 + = 40 → 40 + =
56 + 8 → 56 + = 60 → 60 + =
27 + 6 → 27 + = 30 → 30 + =
73 + 8 → 73 + = 80 → 80 + =
3Your turn. Use whichever route you like, then circle which one you used.
68 + 9 = TEN FIRST / NEXT TEN
46 + 7 = TEN FIRST / NEXT TEN
85 + 8 = TEN FIRST / NEXT TEN
39 + 6 = TEN FIRST / NEXT TEN
57 + 9 = TEN FIRST / NEXT TEN
74 + 8 = TEN FIRST / NEXT TEN
4Write about it. Pick one question from part 3 and explain how you did it.
1. 48/2/47; 66/2/64; 74/1/73; 55/3/52 2. 2/7/47; 4/4/64; 3/3/33; 7/1/81 3. 77, 53, 93, 45, 66, 82