Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 941 · 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 40 × 99 = 3952 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 750 + 817 = 1567 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 84 × 32 = 2683 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 47 × 46 = 2166 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 915 + 438 = 1353 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 94 × 33 = 3102 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 968 + 323 = 1291 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 98 × 27 = 2646 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 168 + 176 = 344 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 946 + 609 = 1555 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 177 + 285 = 462 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 651 + 634 = 1285 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 71 × 33 = 2338 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 725 + 836 = 1558 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 726 + 432 = 1158 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 86 × 86 = 7396 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 60 × 95 = 5704 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 68 × 16 = 1088 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 93 × 21 = 1953 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 36 × 84 = 3024 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 49 × 61 = 2989 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 86 × 51 = 4386 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 36 × 62 = 2232 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 13 × 44 = 571 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 176 + 968 = 1142 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 128 + 680 = 807 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 96 × 30 = 2878 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 983 + 366 = 1349 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 52 × 56 = 2912 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 71 × 40 = 2840 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 61 × 56 = 3416 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 565 + 151 = 716 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 52 × 79 = 4108 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 52 × 33 = 1725 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 28 × 23 = 644 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 62 × 37 = 2303 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 60 × 53 = 3180 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 820 + 441 = 1261 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 904 + 327 = 1222 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 28 × 12 = 344 right or wrong? (a) Right (b) Wrong

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