Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 765 · 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 292 + 241 = 533 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 17 × 67 = 1140 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 33 × 94 = 3104 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 592 + 926 = 1518 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 359 + 408 = 767 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 79 × 85 = 6715 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 519 + 264 = 783 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 287 + 519 = 815 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 64 × 40 = 2553 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 673 + 521 = 1186 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 629 + 178 = 798 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 18 × 52 = 931 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 220 + 131 = 350 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 33 × 58 = 1911 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 484 + 748 = 1226 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 903 + 606 = 1509 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 888 + 117 = 1005 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 858 + 665 = 1523 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 299 + 347 = 646 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 32 × 51 = 1631 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 77 × 37 = 2856 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 795 + 192 = 996 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 532 + 516 = 1048 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 40 × 37 = 1474 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 28 × 64 = 1792 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 836 + 309 = 1145 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 16 × 98 = 1568 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 477 + 126 = 603 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 87 × 84 = 7308 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 679 + 912 = 1600 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 19 × 22 = 416 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 812 + 487 = 1297 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 13 × 53 = 689 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 934 + 226 = 1160 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 83 × 57 = 4731 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 91 × 24 = 2182 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 595 + 378 = 973 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 323 + 549 = 871 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 84 × 84 = 7059 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 862 + 758 = 1620 right or wrong? (a) Right (b) Wrong

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