Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 336 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 49 × 31 = 1528 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 969 + 365 = 1341 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 826 + 159 = 986 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 149 + 122 = 274 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 50 × 25 = 1250 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 28 × 72 = 2025 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 133 + 886 = 1019 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 48 × 35 = 1682 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 84 × 34 = 2855 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 503 + 606 = 1109 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 814 + 152 = 966 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 476 + 841 = 1317 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 623 + 936 = 1565 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 483 + 976 = 1456 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 471 + 339 = 816 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 62 × 49 = 3038 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 14 × 61 = 860 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 727 + 620 = 1340 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 98 × 64 = 6270 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 64 × 49 = 3136 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 80 × 53 = 4240 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 565 + 851 = 1417 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 29 × 96 = 2784 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 256 + 400 = 654 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 346 + 269 = 615 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 76 × 94 = 7144 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 45 × 79 = 3555 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 35 × 59 = 2065 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 790 + 351 = 1141 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 23 × 18 = 414 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 21 × 16 = 332 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 94 × 13 = 1222 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 87 × 64 = 5568 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 823 + 923 = 1749 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 643 + 876 = 1528 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 41 × 14 = 574 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 169 + 217 = 386 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 26 × 81 = 2105 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 997 + 850 = 1846 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 28 × 82 = 2287 right or wrong? (a) Right (b) Wrong

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