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Addition

Addition 1

Find which sum has the odd answer out

Don't use a calculator!!

1. (a) 6 (b) 7 (c) 4

8 5 15  
+10 +12 +6
2. (a) 9 (b) 8 (c) 7
11 9 12
+12 +14 +13  
3. (a) 5

(b)

 18

(c)

 9
16 14 10
+15 +3 +16  
4. (a) 13 (b) 2 (c) 6

8 15 18
+12 +17 +10  
5. (a) 19 (b) 17 (c) 15

11 9 5
+8 +12 +17  
6. (a) 25 (b) 22 (c) 18

7 11 17
+11 +9 +8
7. (a) 24 (b) 31 (c) 29

13 5 12
+15 +17 +11
8. (a) 23 (b) 19 (c) 9

27 22 32
+12 +21 +20

9.

 (a) 28 (b) 17 (c) 42
19 32 9
+25 +24 +22
10. (a) 31 (b) 42 (c) 11

27 13 56
+36 +40 +27
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