Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 546 · 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 479 + 190 = 673 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 63 × 23 = 1449 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 44 × 76 = 3344 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 61 × 34 = 2069 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 496 + 600 = 1096 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 87 × 44 = 3837 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 552 + 459 = 1011 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 44 × 15 = 660 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 943 + 848 = 1791 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 756 + 523 = 1274 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 387 + 553 = 940 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 133 + 251 = 378 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 91 × 12 = 1088 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 66 × 26 = 1712 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 400 + 316 = 711 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 23 × 19 = 434 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 706 + 865 = 1567 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 71 × 86 = 6099 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 36 × 98 = 3528 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 67 × 69 = 4623 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 187 + 360 = 547 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 29 × 12 = 346 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 878 + 441 = 1319 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 22 × 77 = 1697 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 93 × 25 = 2320 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 362 + 602 = 973 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 288 + 333 = 621 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 500 + 595 = 1104 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 184 + 345 = 528 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 12 × 64 = 777 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 96 × 64 = 6144 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 160 + 108 = 268 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 37 × 16 = 592 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 58 × 17 = 977 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 15 × 87 = 1305 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 72 × 42 = 3022 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 99 × 21 = 2079 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 37 × 74 = 2738 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 19 × 69 = 1311 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 471 + 550 = 1019 right or wrong? (a) Right (b) Wrong

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