Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 47 · 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 × 47 = 752 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 224 + 942 = 1166 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 17 × 24 = 399 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 337 + 234 = 566 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 346 + 374 = 728 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 14 × 23 = 322 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 494 + 319 = 813 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 68 × 13 = 881 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 998 + 342 = 1340 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 418 + 650 = 1071 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 41 × 79 = 3240 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 279 + 671 = 957 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 600 + 135 = 735 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 34 × 70 = 2387 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 132 + 232 = 364 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 76 × 82 = 6236 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 922 + 500 = 1422 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 90 × 45 = 4041 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 31 × 50 = 1550 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 354 + 391 = 745 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 447 + 972 = 1413 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 760 + 211 = 973 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 868 + 312 = 1175 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 881 + 618 = 1499 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 84 × 91 = 7637 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 840 + 143 = 983 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 44 × 64 = 2823 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 256 + 346 = 602 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 790 + 507 = 1297 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 97 × 12 = 1158 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 35 × 21 = 726 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 20 × 28 = 560 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 28 × 60 = 1686 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 797 + 807 = 1604 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 363 + 740 = 1103 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 13 × 83 = 1079 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 120 + 745 = 869 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 243 + 856 = 1096 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 48 × 99 = 4752 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 117 + 387 = 510 right or wrong? (a) Right (b) Wrong

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