Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 795 · 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 16 × 79 = 1265 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 39 × 18 = 702 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 595 + 768 = 1362 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 536 + 702 = 1238 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 655 + 362 = 1017 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 27 × 15 = 409 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 246 + 486 = 739 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 71 × 92 = 6529 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 87 × 19 = 1649 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 42 × 56 = 2343 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 623 + 321 = 951 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 917 + 114 = 1030 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 88 × 95 = 8357 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 418 + 417 = 835 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 50 × 14 = 700 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 269 + 353 = 622 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 944 + 552 = 1489 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 47 × 13 = 607 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 670 + 531 = 1201 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 129 + 561 = 696 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 61 × 97 = 5917 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 455 + 546 = 1001 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 257 + 515 = 775 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 23 × 70 = 1610 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 78 × 47 = 3670 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 327 + 621 = 947 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 585 + 692 = 1277 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 351 + 352 = 703 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 697 + 490 = 1180 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 80 × 33 = 2640 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 13 × 81 = 1052 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 78 × 52 = 4056 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 904 + 789 = 1685 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 411 + 917 = 1320 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 77 × 70 = 5381 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 54 × 24 = 1292 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 79 × 87 = 6873 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 23 × 18 = 414 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 29 × 52 = 1503 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 70 × 89 = 6230 right or wrong? (a) Right (b) Wrong

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