Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 11 · 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 375 + 932 = 1307 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 899 + 175 = 1065 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 83 × 95 = 7886 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 894 + 762 = 1656 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 41 × 37 = 1517 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 908 + 153 = 1052 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 15 × 95 = 1432 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 754 + 178 = 932 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 561 + 630 = 1189 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 372 + 545 = 911 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 15 × 29 = 435 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 26 × 62 = 1612 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 274 + 419 = 689 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 34 × 28 = 953 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 860 + 490 = 1351 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 998 + 314 = 1318 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 522 + 418 = 936 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 81 × 29 = 2355 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 95 × 59 = 5605 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 45 × 70 = 3145 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 451 + 278 = 729 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 922 + 125 = 1046 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 655 + 260 = 923 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 71 × 40 = 2833 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 599 + 806 = 1405 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 80 = 2634 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 77 × 83 = 6391 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 28 × 71 = 1988 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 35 × 50 = 1755 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 99 × 33 = 3267 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 315 + 388 = 703 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 91 × 72 = 6552 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 660 + 404 = 1064 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 169 + 847 = 1015 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 364 + 704 = 1065 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 116 + 669 = 787 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 87 × 93 = 8096 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 650 + 506 = 1149 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 869 + 904 = 1776 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 91 × 38 = 3458 right or wrong? (a) Wrong (b) Right

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