Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 442 · 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 136 + 329 = 473 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 64 × 37 = 2368 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 64 × 15 = 958 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 301 + 718 = 1020 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 167 + 498 = 665 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 351 + 380 = 724 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 98 × 70 = 6860 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 60 × 50 = 2998 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 153 + 167 = 320 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 125 + 476 = 606 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 46 × 39 = 1794 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 38 × 26 = 987 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 25 × 50 = 1250 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 286 + 495 = 781 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 58 × 88 = 5105 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 66 × 48 = 3168 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 305 + 618 = 923 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 75 × 29 = 2175 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 289 + 763 = 1052 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 28 × 24 = 672 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 22 × 68 = 1492 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 76 × 17 = 1292 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 40 × 99 = 3960 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 760 + 921 = 1681 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 19 × 65 = 1235 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 243 + 361 = 604 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 53 × 65 = 3445 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 48 × 94 = 4510 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 44 × 49 = 2156 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 90 × 75 = 6747 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 78 × 13 = 1020 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 60 × 99 = 5949 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 94 × 42 = 3948 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 49 × 63 = 3087 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 826 + 511 = 1329 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 73 × 78 = 5694 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 167 + 797 = 961 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 599 + 397 = 996 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 15 × 13 = 195 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 399 + 349 = 749 right or wrong? (a) Right (b) Wrong

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