Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 119 · 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 81 × 55 = 4455 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 42 × 36 = 1519 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 80 × 34 = 2719 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 79 × 43 = 3397 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 672 + 975 = 1647 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 71 × 40 = 2840 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 14 × 24 = 339 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 59 × 17 = 1003 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 59 × 31 = 1829 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 706 + 528 = 1234 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 679 + 777 = 1450 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 563 + 606 = 1169 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 49 × 35 = 1714 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 845 + 441 = 1278 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 262 + 473 = 735 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 563 + 359 = 922 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 176 + 482 = 658 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 357 + 188 = 548 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 21 × 17 = 366 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 52 × 99 = 5153 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 43 × 98 = 4206 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 220 + 106 = 318 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 93 × 87 = 8098 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 88 × 80 = 7040 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 291 + 954 = 1242 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 76 × 38 = 2889 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 48 × 97 = 4656 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 13 × 28 = 364 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 687 + 770 = 1448 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 43 × 43 = 1852 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 838 + 682 = 1524 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 196 + 332 = 528 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 486 + 885 = 1371 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 764 + 555 = 1319 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 69 × 94 = 6489 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 869 + 109 = 978 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 14 × 40 = 560 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 905 + 627 = 1532 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 516 + 860 = 1376 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 27 × 45 = 1207 right or wrong? (a) Wrong (b) Right

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