Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 662 · 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 63 × 93 = 5861 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 16 × 17 = 277 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 92 × 32 = 2944 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 571 + 151 = 731 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 20 × 22 = 442 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 22 × 16 = 352 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 35 × 42 = 1470 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 456 + 121 = 577 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 38 × 84 = 3183 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 89 × 23 = 2047 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 243 + 699 = 942 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 43 × 88 = 3784 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 51 × 36 = 1836 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 43 × 54 = 2322 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 539 + 677 = 1216 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 142 + 436 = 578 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 76 × 81 = 6156 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 48 × 56 = 2687 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 55 × 79 = 4345 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 68 × 92 = 6249 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 351 + 667 = 1012 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 975 + 984 = 1959 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 576 + 862 = 1446 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 983 + 417 = 1404 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 644 + 219 = 865 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 35 × 31 = 1077 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 17 × 87 = 1486 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 16 × 66 = 1063 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 65 × 73 = 4746 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 48 × 33 = 1578 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 667 + 690 = 1357 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 978 + 422 = 1400 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 86 × 68 = 5848 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 58 × 89 = 5162 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 112 + 666 = 780 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 751 + 927 = 1678 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 976 + 778 = 1754 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 657 + 258 = 915 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 90 × 13 = 1170 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 316 + 484 = 800 right or wrong? (a) Wrong (b) Right

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