Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 562 · 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 247 + 545 = 795 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 13 × 59 = 771 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 28 × 49 = 1380 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 40 × 85 = 3400 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 915 + 343 = 1258 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 63 × 77 = 4851 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 84 × 90 = 7560 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 23 × 51 = 1173 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 43 × 97 = 4164 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 75 × 55 = 4125 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 98 × 82 = 8036 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 91 × 83 = 7553 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 19 × 29 = 545 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 354 + 841 = 1195 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 23 × 77 = 1771 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 73 × 33 = 2409 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 46 × 14 = 644 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 13 × 92 = 1196 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 320 + 404 = 720 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 709 + 689 = 1398 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 59 × 38 = 2234 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 27 × 27 = 720 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 51 × 16 = 816 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 617 + 116 = 733 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 169 + 539 = 708 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 295 + 284 = 583 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 19 × 42 = 798 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 282 + 378 = 659 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 16 × 21 = 334 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 35 × 52 = 1820 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 40 × 99 = 3957 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 78 × 62 = 4836 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 928 + 729 = 1657 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 456 + 892 = 1348 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 82 × 94 = 7714 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 182 + 710 = 900 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 113 + 451 = 564 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 63 × 92 = 5791 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 996 + 394 = 1390 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 53 × 35 = 1863 right or wrong? (a) Right (b) Wrong

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