Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 536 · 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 905 + 548 = 1453 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 32 × 46 = 1469 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 93 × 40 = 3725 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 613 + 902 = 1515 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 24 × 79 = 1896 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 75 × 58 = 4350 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 748 + 241 = 988 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 77 × 44 = 3381 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 752 + 731 = 1483 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 89 × 92 = 8186 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 466 + 591 = 1063 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 241 + 256 = 497 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 585 + 541 = 1126 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 79 × 58 = 4582 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 656 + 141 = 796 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 50 × 25 = 1251 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 36 × 28 = 1015 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 43 × 33 = 1419 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 952 + 979 = 1931 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 654 + 724 = 1381 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 290 + 175 = 466 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 30 × 22 = 659 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 70 × 26 = 1820 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 57 × 55 = 3135 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 21 × 16 = 334 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 599 + 526 = 1128 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 436 + 121 = 557 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 237 + 382 = 626 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 837 + 190 = 1027 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 86 × 55 = 4726 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 20 × 62 = 1240 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 507 + 589 = 1095 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 409 + 716 = 1125 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 274 + 809 = 1091 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 28 × 52 = 1448 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 291 + 559 = 851 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 317 + 575 = 892 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 39 × 53 = 2067 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 888 + 399 = 1289 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 790 + 368 = 1149 right or wrong? (a) Right (b) Wrong

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