Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 631 · 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 986 + 369 = 1356 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 169 + 236 = 405 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 51 × 70 = 3573 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 325 + 884 = 1213 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 929 + 118 = 1047 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 77 × 43 = 3311 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 97 × 62 = 6014 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 45 × 19 = 858 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 109 + 617 = 720 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 114 + 254 = 368 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 89 × 67 = 5963 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 278 + 256 = 534 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 53 × 34 = 1810 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 66 × 41 = 2706 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 25 × 61 = 1522 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 84 × 43 = 3614 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 65 × 47 = 3052 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 396 + 278 = 674 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 918 + 765 = 1685 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 91 × 92 = 8370 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 601 + 299 = 907 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 66 × 71 = 4686 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 78 × 35 = 2732 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 331 + 676 = 1005 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 77 × 18 = 1384 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 51 × 86 = 4386 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 41 × 84 = 3443 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 15 × 71 = 1065 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 123 + 472 = 601 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 51 × 33 = 1683 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 778 + 297 = 1075 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 132 + 181 = 313 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 57 × 79 = 4496 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 413 + 105 = 526 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 167 + 945 = 1121 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 51 × 12 = 612 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 87 × 58 = 5046 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 844 + 179 = 1023 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 78 × 15 = 1173 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 46 × 39 = 1794 right or wrong? (a) Wrong (b) Right

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