Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 764 · 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 32 × 59 = 1888 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 743 + 314 = 1058 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 626 + 228 = 854 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 304 + 602 = 908 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 560 + 299 = 859 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 86 × 15 = 1290 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 949 + 110 = 1059 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 195 + 578 = 767 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 862 + 478 = 1340 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 279 + 495 = 774 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 440 + 127 = 566 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 588 + 968 = 1559 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 486 + 188 = 668 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 744 + 882 = 1617 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 145 + 509 = 654 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 32 × 64 = 2045 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 568 + 132 = 701 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 42 × 48 = 2016 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 78 × 30 = 2333 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 35 × 42 = 1470 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 250 + 491 = 749 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 444 + 371 = 813 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 27 × 94 = 2538 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 72 × 76 = 5472 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 125 + 486 = 618 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 55 × 75 = 4119 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 33 × 52 = 1714 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 81 × 24 = 1942 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 89 × 59 = 5251 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 80 × 16 = 1277 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 98 × 15 = 1470 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 72 × 80 = 5760 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 18 × 61 = 1106 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 81 × 33 = 2673 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 92 × 43 = 3954 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 57 × 46 = 2622 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 932 + 388 = 1320 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 57 × 39 = 2223 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 40 × 70 = 2791 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 860 + 327 = 1188 right or wrong? (a) Wrong (b) Right

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