Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 849 · 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 798 + 158 = 956 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 454 + 238 = 695 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 156 + 494 = 650 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 97 × 35 = 3395 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 22 × 76 = 1672 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 33 × 93 = 3067 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 800 + 192 = 992 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 42 × 94 = 3954 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 74 × 74 = 5476 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 163 + 712 = 871 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 582 + 365 = 947 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 477 + 895 = 1378 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 360 + 492 = 843 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 21 × 31 = 651 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 278 + 776 = 1054 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 96 × 72 = 6912 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 235 + 341 = 576 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 35 × 62 = 2170 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 15 × 42 = 630 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 13 × 84 = 1087 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 96 × 88 = 8448 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 84 × 64 = 5383 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 50 × 89 = 4448 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 77 × 23 = 1771 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 51 × 28 = 1436 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 82 × 91 = 7462 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 704 + 869 = 1573 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 208 + 366 = 567 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 83 × 22 = 1829 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 111 + 133 = 244 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 18 × 99 = 1777 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 68 × 32 = 2168 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 43 × 36 = 1548 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 281 + 271 = 543 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 25 × 96 = 2394 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 543 + 365 = 908 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 956 + 318 = 1268 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 27 × 19 = 515 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 201 + 516 = 722 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 79 × 82 = 6475 right or wrong? (a) Wrong (b) Right

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