Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 976 · 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 80 × 36 = 2880 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 65 × 71 = 4615 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 926 + 555 = 1479 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 77 × 77 = 5929 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 94 × 81 = 7614 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 89 × 47 = 4183 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 18 × 48 = 864 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 25 × 52 = 1302 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 377 + 368 = 745 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 364 + 453 = 817 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 32 × 74 = 2366 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 172 + 221 = 393 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 775 + 540 = 1312 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 595 + 558 = 1158 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 54 × 20 = 1080 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 231 + 604 = 831 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 656 + 614 = 1270 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 40 × 38 = 1521 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 801 + 402 = 1205 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 822 + 475 = 1297 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 818 + 227 = 1046 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 959 + 838 = 1797 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 352 + 670 = 1018 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 782 + 226 = 1008 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 57 × 76 = 4332 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 195 + 111 = 300 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 340 + 423 = 763 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 96 × 88 = 8448 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 51 × 20 = 1020 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 917 + 626 = 1543 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 439 + 526 = 960 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 617 + 582 = 1204 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 121 + 907 = 1022 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 19 × 30 = 563 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 49 × 95 = 4657 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 77 × 55 = 4226 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 14 × 55 = 770 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 276 + 747 = 1023 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 952 + 642 = 1594 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 37 × 91 = 3367 right or wrong? (a) Right (b) Wrong

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