Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 992 · 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 57 × 16 = 921 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 481 + 300 = 781 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 517 + 457 = 974 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 722 + 785 = 1512 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 66 × 81 = 5346 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 58 × 45 = 2610 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 59 × 53 = 3119 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 77 × 86 = 6615 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 37 × 44 = 1629 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 439 + 889 = 1323 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 84 × 17 = 1429 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 22 × 76 = 1672 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 14 × 93 = 1303 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 442 + 174 = 616 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 64 × 41 = 2625 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 776 + 784 = 1560 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 894 + 951 = 1844 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 46 × 90 = 4140 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 29 × 93 = 2697 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 99 × 98 = 9702 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 788 + 526 = 1314 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 337 + 159 = 505 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 507 + 732 = 1245 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 803 + 113 = 916 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 318 + 453 = 770 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 64 × 56 = 3583 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 136 + 989 = 1129 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 27 × 24 = 657 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 622 + 603 = 1225 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 35 × 53 = 1863 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 112 + 902 = 1014 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 59 × 94 = 5546 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 37 × 81 = 2998 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 656 + 291 = 953 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 899 + 618 = 1517 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 19 × 88 = 1665 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 22 × 70 = 1532 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 50 × 44 = 2200 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 187 + 548 = 740 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 411 + 626 = 1037 right or wrong? (a) Wrong (b) Right

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