Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 363 · 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 90 × 67 = 6036 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 14 × 42 = 588 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 16 × 81 = 1297 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 287 + 503 = 790 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 15 × 83 = 1245 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 424 + 797 = 1218 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 315 + 927 = 1242 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 84 × 63 = 5292 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 40 × 16 = 640 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 91 × 52 = 4732 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 245 + 882 = 1120 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 749 + 592 = 1335 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 76 × 93 = 7070 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 26 × 28 = 726 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 56 × 12 = 672 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 968 + 666 = 1632 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 48 × 20 = 960 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 620 + 183 = 806 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 80 × 30 = 2400 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 349 + 144 = 493 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 18 × 36 = 648 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 77 × 19 = 1464 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 15 × 92 = 1380 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 98 × 86 = 8428 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 15 × 65 = 982 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 503 + 924 = 1425 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 70 × 55 = 3850 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 517 + 191 = 707 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 933 + 556 = 1495 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 27 × 56 = 1505 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 780 + 686 = 1466 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 544 + 699 = 1242 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 69 × 71 = 4897 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 597 + 253 = 850 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 501 + 979 = 1480 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 867 + 307 = 1174 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 547 + 251 = 805 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 946 + 197 = 1143 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 59 × 25 = 1475 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 429 + 482 = 911 right or wrong? (a) Wrong (b) Right

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