Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 877 · 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 579 + 775 = 1357 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 423 + 179 = 596 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 32 × 85 = 2720 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 165 + 796 = 956 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 84 × 65 = 5463 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 998 + 216 = 1214 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 74 × 83 = 6142 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 558 + 665 = 1218 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 326 + 662 = 988 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 220 + 612 = 838 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 125 + 493 = 618 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 615 + 332 = 947 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 109 + 187 = 291 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 39 × 50 = 1955 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 675 + 435 = 1110 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 504 + 556 = 1060 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 64 × 64 = 4089 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 27 × 36 = 972 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 211 + 993 = 1204 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 31 × 94 = 2906 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 58 × 12 = 696 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 330 + 200 = 532 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 764 + 160 = 930 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 332 + 759 = 1082 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 658 + 823 = 1480 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 14 × 74 = 1033 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 16 × 53 = 841 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 42 × 24 = 1007 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 680 + 803 = 1483 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 257 + 823 = 1072 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 12 × 32 = 384 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 295 + 114 = 402 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 32 × 66 = 2112 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 94 × 70 = 6583 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 53 × 20 = 1060 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 17 × 99 = 1683 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 81 × 15 = 1215 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 124 + 422 = 548 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 16 × 56 = 900 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 572 + 309 = 881 right or wrong? (a) Right (b) Wrong

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