Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 821 · 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 747 + 556 = 1303 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 57 × 98 = 5580 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 847 + 314 = 1170 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 94 × 78 = 7336 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 21 × 53 = 1113 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 74 × 57 = 4213 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 373 + 855 = 1228 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 69 × 31 = 2148 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 941 + 137 = 1074 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 29 × 65 = 1885 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 87 × 69 = 6003 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 50 × 64 = 3200 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 594 + 410 = 1004 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 40 × 57 = 2280 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 857 + 405 = 1262 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 646 + 297 = 945 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 39 × 31 = 1218 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 818 + 663 = 1481 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 28 × 66 = 1845 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 80 × 55 = 4403 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 648 + 935 = 1583 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 31 × 18 = 549 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 48 × 89 = 4269 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 35 × 62 = 2170 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 43 × 31 = 1333 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 39 × 67 = 2613 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 521 + 911 = 1433 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 81 × 20 = 1620 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 56 × 47 = 2632 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 825 + 116 = 941 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 56 × 12 = 676 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 62 × 35 = 2171 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 420 + 156 = 581 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 702 + 175 = 883 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 114 + 435 = 549 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 51 × 91 = 4641 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 426 + 957 = 1377 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 287 + 484 = 767 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 87 × 27 = 2343 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 576 + 606 = 1182 right or wrong? (a) Wrong (b) Right

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