Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 87 · 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 32 × 70 = 2240 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 85 × 24 = 2045 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 470 + 869 = 1339 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 31 × 91 = 2815 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 758 + 380 = 1138 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 190 + 254 = 444 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 93 × 99 = 9207 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 939 + 743 = 1690 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 87 × 87 = 7569 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 510 + 538 = 1051 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 70 × 32 = 2249 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 980 + 809 = 1785 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 616 + 671 = 1280 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 731 + 588 = 1328 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 736 + 445 = 1172 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 231 + 957 = 1188 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 77 × 14 = 1078 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 397 + 594 = 991 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 16 × 48 = 768 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 114 + 360 = 473 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 702 + 521 = 1220 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 13 × 69 = 906 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 63 × 30 = 1890 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 290 + 390 = 680 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 432 + 286 = 724 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 196 + 287 = 483 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 284 + 316 = 600 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 623 + 820 = 1443 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 177 + 132 = 309 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 64 × 96 = 6143 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 476 + 684 = 1169 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 49 × 63 = 3096 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 42 × 69 = 2907 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 711 + 557 = 1268 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 61 × 27 = 1643 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 92 × 51 = 4692 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 44 × 56 = 2464 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 42 × 95 = 3983 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 54 × 91 = 4905 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 76 × 14 = 1064 right or wrong? (a) Wrong (b) Right

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