Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 303 · 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 171 + 493 = 664 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 807 + 513 = 1320 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 555 + 144 = 695 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 308 + 645 = 946 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 25 × 64 = 1604 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 482 + 999 = 1481 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 64 × 96 = 6143 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 12 × 31 = 373 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 917 + 961 = 1877 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 129 + 628 = 757 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 290 + 904 = 1202 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 98 × 49 = 4802 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 65 × 53 = 3445 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 524 + 777 = 1301 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 12 × 57 = 679 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 136 + 234 = 376 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 22 × 83 = 1826 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 75 × 95 = 7125 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 531 + 119 = 645 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 43 × 27 = 1169 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 396 + 393 = 789 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 38 × 54 = 2048 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 106 + 996 = 1098 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 45 × 87 = 3915 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 668 + 254 = 918 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 459 + 476 = 935 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 60 × 88 = 5271 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 14 × 97 = 1354 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 561 + 699 = 1255 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 36 × 30 = 1074 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 43 × 25 = 1080 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 733 + 263 = 1001 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 61 × 44 = 2684 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 81 × 23 = 1863 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 55 × 56 = 3080 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 463 + 141 = 604 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 140 + 114 = 254 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 45 × 55 = 2475 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 355 + 236 = 599 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 801 + 825 = 1626 right or wrong? (a) Wrong (b) Right

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