Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 664 · 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 804 + 374 = 1178 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 560 + 438 = 998 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 88 × 91 = 8008 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 128 + 179 = 307 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 98 × 28 = 2744 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 22 × 48 = 1056 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 40 × 55 = 2200 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 637 + 126 = 763 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 95 × 12 = 1144 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 16 × 31 = 494 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 89 × 66 = 5871 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 33 × 33 = 1089 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 53 × 35 = 1862 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 601 + 633 = 1226 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 701 + 254 = 946 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 21 × 75 = 1573 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 445 + 110 = 555 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 83 × 93 = 7719 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 356 + 343 = 699 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 580 + 406 = 986 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 87 × 40 = 3485 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 18 × 58 = 1051 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 931 + 419 = 1350 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 575 + 304 = 879 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 17 × 28 = 476 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 58 × 26 = 1508 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 850 + 230 = 1073 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 48 × 96 = 4608 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 883 + 380 = 1270 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 85 × 25 = 2116 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 46 × 39 = 1794 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 95 × 38 = 3610 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 691 + 209 = 900 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 78 × 81 = 6314 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 437 + 332 = 769 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 144 + 337 = 485 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 995 + 803 = 1795 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 12 × 20 = 240 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 687 + 931 = 1611 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 32 × 59 = 1888 right or wrong? (a) Wrong (b) Right

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