Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 35 · 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 837 + 509 = 1344 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 173 + 177 = 350 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 599 + 571 = 1178 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 454 + 877 = 1331 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 120 + 184 = 298 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 97 × 71 = 6887 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 46 × 87 = 4002 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 566 + 597 = 1162 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 169 + 511 = 680 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 77 × 42 = 3234 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 83 × 54 = 4482 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 217 + 185 = 402 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 94 × 32 = 2999 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 760 + 594 = 1350 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 65 × 51 = 3315 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 21 × 37 = 772 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 65 × 98 = 6370 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 33 × 66 = 2178 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 473 + 491 = 964 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 812 + 325 = 1136 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 85 × 36 = 3056 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 281 + 111 = 392 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 75 × 26 = 1950 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 73 × 18 = 1314 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 33 × 67 = 2211 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 596 + 532 = 1128 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 940 + 143 = 1083 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 79 × 63 = 4985 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 26 × 70 = 1819 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 16 × 78 = 1251 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 57 × 34 = 1937 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 50 × 12 = 600 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 19 × 83 = 1577 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 799 + 734 = 1533 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 715 + 495 = 1219 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 42 × 44 = 1848 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 12 × 62 = 748 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 253 + 703 = 956 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 24 × 60 = 1440 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 729 + 425 = 1155 right or wrong? (a) Right (b) Wrong

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