Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 721 · 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 677 + 238 = 915 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 22 × 68 = 1496 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 341 + 410 = 751 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 83 × 67 = 5559 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 950 + 281 = 1225 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 696 + 189 = 885 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 789 + 836 = 1625 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 49 × 96 = 4711 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 74 × 47 = 3478 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 803 + 455 = 1258 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 55 × 45 = 2472 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 134 + 581 = 714 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 97 × 60 = 5818 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 325 + 515 = 840 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 81 × 30 = 2433 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 728 + 489 = 1217 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 968 + 985 = 1953 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 500 + 481 = 981 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 778 + 119 = 894 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 934 + 788 = 1717 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 43 × 69 = 2967 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 91 × 68 = 6195 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 371 + 942 = 1310 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 808 + 638 = 1446 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 55 × 66 = 3621 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 57 × 71 = 4047 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 86 × 46 = 3965 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 342 + 839 = 1188 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 80 × 64 = 5127 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 59 × 65 = 3835 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 17 × 87 = 1479 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 795 + 374 = 1166 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 62 × 58 = 3596 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 38 × 44 = 1672 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 286 + 956 = 1245 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 333 + 435 = 776 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 614 + 228 = 842 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 469 + 650 = 1121 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 843 + 843 = 1686 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 966 + 660 = 1626 right or wrong? (a) Right (b) Wrong

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