Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 374 · 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 89 × 93 = 8277 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 28 × 55 = 1539 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 84 × 44 = 3696 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 46 × 16 = 736 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 900 + 186 = 1086 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 85 × 22 = 1870 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 869 + 383 = 1252 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 88 × 16 = 1409 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 39 × 41 = 1600 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 895 + 379 = 1271 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 38 × 88 = 3344 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 31 × 16 = 496 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 719 + 789 = 1508 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 423 + 158 = 583 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 755 + 606 = 1361 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 417 + 408 = 822 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 20 × 80 = 1600 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 29 × 45 = 1305 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 71 × 92 = 6527 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 80 × 12 = 958 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 53 × 87 = 4611 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 476 + 589 = 1065 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 37 × 27 = 997 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 17 × 94 = 1601 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 14 × 40 = 560 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 648 + 119 = 767 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 514 + 220 = 734 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 65 × 98 = 6372 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 395 + 519 = 914 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 69 × 16 = 1112 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 527 + 678 = 1205 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 24 × 59 = 1423 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 91 × 82 = 7462 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 52 × 29 = 1506 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 48 × 35 = 1688 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 267 + 616 = 883 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 20 × 75 = 1500 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 13 × 49 = 637 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 48 × 17 = 825 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 87 × 59 = 5133 right or wrong? (a) Wrong (b) Right

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