Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 370 · 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 70 × 17 = 1183 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 76 × 76 = 5773 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 242 + 843 = 1086 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 235 + 744 = 979 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 17 × 63 = 1071 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 858 + 717 = 1575 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 419 + 189 = 617 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 26 × 39 = 1014 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 493 + 271 = 762 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 90 × 77 = 6932 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 19 × 34 = 646 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 87 × 91 = 7917 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 228 + 885 = 1113 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 65 × 89 = 5785 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 547 + 165 = 712 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 397 + 535 = 934 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 53 × 34 = 1802 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 963 + 441 = 1404 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 574 + 988 = 1562 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 84 × 99 = 8316 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 66 × 65 = 4290 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 604 + 723 = 1332 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 495 + 543 = 1044 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 497 + 524 = 1021 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 55 × 56 = 3080 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 55 × 25 = 1384 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 44 × 12 = 528 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 15 × 72 = 1084 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 793 + 497 = 1284 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 23 × 57 = 1308 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 15 × 86 = 1290 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 33 × 44 = 1452 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 435 + 401 = 842 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 228 + 205 = 434 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 33 × 24 = 788 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 85 × 22 = 1875 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 987 + 116 = 1103 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 50 × 35 = 1759 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 377 + 522 = 899 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 66 × 22 = 1452 right or wrong? (a) Right (b) Wrong

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