Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 630 · 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 13 × 27 = 342 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 398 + 336 = 734 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 36 × 20 = 718 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 31 × 43 = 1325 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 970 + 153 = 1122 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 464 + 400 = 865 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 50 × 25 = 1250 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 202 + 863 = 1065 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 16 × 88 = 1408 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 93 × 95 = 8832 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 358 + 199 = 557 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 68 × 82 = 5580 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 29 × 50 = 1450 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 643 + 262 = 905 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 763 + 131 = 894 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 254 + 312 = 566 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 651 + 648 = 1299 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 50 × 59 = 2946 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 83 × 63 = 5229 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 53 × 47 = 2489 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 570 + 584 = 1156 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 819 + 357 = 1176 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 231 + 210 = 435 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 90 × 58 = 5226 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 986 + 235 = 1221 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 551 + 173 = 724 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 968 + 808 = 1771 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 868 + 777 = 1645 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 860 + 575 = 1435 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 836 + 634 = 1464 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 59 × 66 = 3895 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 212 + 717 = 934 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 446 + 283 = 729 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 14 × 59 = 818 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 309 + 902 = 1208 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 88 × 22 = 1936 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 23 × 37 = 851 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 20 × 88 = 1760 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 97 × 31 = 3007 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 51 × 77 = 3922 right or wrong? (a) Right (b) Wrong

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