Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 64 · 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 813 + 750 = 1563 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 99 × 18 = 1782 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 469 + 624 = 1095 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 32 × 77 = 2459 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 17 × 29 = 493 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 34 × 73 = 2473 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 41 × 79 = 3239 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 392 + 980 = 1366 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 729 + 723 = 1452 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 13 × 18 = 234 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 383 + 973 = 1351 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 475 + 196 = 666 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 49 × 46 = 2259 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 777 + 340 = 1117 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 32 × 57 = 1822 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 32 × 28 = 896 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 446 + 526 = 972 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 89 × 93 = 8277 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 42 × 59 = 2478 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 12 × 37 = 444 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 894 + 813 = 1701 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 894 + 439 = 1326 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 369 + 560 = 924 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 15 × 22 = 333 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 95 × 69 = 6552 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 82 × 67 = 5494 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 44 × 70 = 3080 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 90 × 21 = 1890 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 511 + 649 = 1160 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 797 + 965 = 1760 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 92 × 90 = 8284 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 37 × 90 = 3335 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 66 × 31 = 2050 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 56 × 13 = 728 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 31 × 18 = 558 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 19 × 74 = 1402 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 35 × 41 = 1435 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 21 × 58 = 1210 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 81 × 22 = 1791 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 29 × 82 = 2378 right or wrong? (a) Right (b) Wrong

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