Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 292 · 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 51 × 92 = 4692 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 420 + 554 = 974 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 68 × 60 = 4080 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 335 + 552 = 879 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 15 × 49 = 735 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 19 × 15 = 285 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 42 × 62 = 2598 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 238 + 133 = 372 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 12 × 55 = 669 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 651 + 307 = 958 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 46 × 13 = 596 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 611 + 341 = 952 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 50 × 17 = 859 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 55 × 84 = 4625 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 172 + 901 = 1073 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 468 + 690 = 1158 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 830 + 144 = 974 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 818 + 152 = 962 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 23 × 81 = 1866 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 26 × 88 = 2288 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 90 × 22 = 1988 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 692 + 126 = 818 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 97 × 93 = 9021 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 13 × 26 = 338 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 689 + 986 = 1672 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 13 × 75 = 975 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 502 + 420 = 922 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 19 × 13 = 240 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 353 + 198 = 551 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 760 + 721 = 1481 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 87 × 92 = 8004 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 524 + 177 = 707 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 425 + 128 = 553 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 141 + 796 = 937 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 812 + 794 = 1600 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 611 + 651 = 1262 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 22 × 61 = 1343 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 139 + 623 = 762 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 85 × 25 = 2125 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 331 + 707 = 1033 right or wrong? (a) Wrong (b) Right

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