Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 688 · 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 332 + 791 = 1117 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 88 × 98 = 8624 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 561 + 861 = 1424 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 474 + 668 = 1142 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 58 × 44 = 2543 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 597 + 492 = 1083 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 70 × 92 = 6440 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 14 × 41 = 574 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 269 + 164 = 432 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 109 + 175 = 292 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 684 + 856 = 1549 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 46 × 96 = 4414 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 814 + 462 = 1268 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 628 + 142 = 772 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 960 + 921 = 1880 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 23 × 89 = 2043 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 62 × 40 = 2480 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 22 × 70 = 1548 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 20 × 79 = 1580 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 875 + 537 = 1420 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 31 × 61 = 1890 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 804 + 948 = 1751 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 13 × 59 = 767 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 25 × 87 = 2175 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 971 + 141 = 1121 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 93 × 40 = 3719 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 734 + 888 = 1622 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 99 × 28 = 2764 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 66 × 48 = 3168 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 48 × 21 = 1002 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 62 × 32 = 1984 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 30 × 30 = 900 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 19 × 31 = 589 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 674 + 126 = 798 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 67 × 12 = 804 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 56 × 71 = 3972 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 555 + 241 = 794 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 89 × 27 = 2403 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 126 + 553 = 673 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 878 + 294 = 1165 right or wrong? (a) Wrong (b) Right

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