Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 987 · 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 795 + 203 = 998 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 209 + 136 = 339 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 99 × 72 = 7128 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 42 × 90 = 3771 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 92 × 12 = 1099 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 83 × 13 = 1079 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 94 × 42 = 3948 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 727 + 446 = 1173 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 28 × 71 = 1988 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 62 × 91 = 5642 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 358 + 255 = 613 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 56 × 46 = 2573 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 92 × 72 = 6624 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 99 × 35 = 3465 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 624 + 544 = 1166 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 96 × 76 = 7296 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 147 + 171 = 314 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 488 + 883 = 1375 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 247 + 344 = 591 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 590 + 378 = 968 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 87 × 35 = 3045 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 17 × 55 = 930 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 88 × 99 = 8712 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 30 × 26 = 782 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 561 + 303 = 866 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 32 × 87 = 2784 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 92 × 65 = 5978 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 58 × 18 = 1044 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 91 × 28 = 2548 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 485 + 210 = 695 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 12 × 30 = 356 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 74 × 40 = 2960 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 176 + 367 = 543 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 17 × 57 = 962 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 121 + 329 = 450 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 244 + 160 = 404 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 134 + 524 = 658 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 60 × 96 = 5767 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 34 × 40 = 1355 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 48 × 29 = 1398 right or wrong? (a) Wrong (b) Right

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