Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 487 · 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 71 × 30 = 2130 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 91 × 16 = 1456 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 964 + 194 = 1158 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 168 + 609 = 777 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 27 × 77 = 2081 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 491 + 885 = 1376 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 760 + 271 = 1040 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 80 × 84 = 6720 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 31 × 76 = 2356 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 80 × 30 = 2400 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 15 × 77 = 1158 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 35 × 83 = 2905 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 70 × 88 = 6161 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 670 + 848 = 1519 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 139 + 847 = 984 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 94 × 53 = 4988 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 208 + 407 = 615 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 364 + 326 = 690 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 362 + 483 = 852 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 937 + 311 = 1248 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 706 + 170 = 876 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 531 + 660 = 1197 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 392 + 915 = 1307 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 266 + 169 = 441 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 59 × 37 = 2179 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 14 × 59 = 826 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 99 × 18 = 1782 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 295 + 987 = 1282 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 188 + 282 = 470 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 65 × 30 = 1949 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 759 + 522 = 1284 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 38 × 64 = 2432 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 280 + 452 = 732 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 130 + 542 = 681 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 80 × 69 = 5512 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 79 × 40 = 3159 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 824 + 748 = 1572 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 434 + 695 = 1130 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 22 × 96 = 2112 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 323 + 178 = 495 right or wrong? (a) Wrong (b) Right

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