Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 296 · 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 744 + 366 = 1110 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 32 × 19 = 608 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 21 × 95 = 1992 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 500 + 392 = 894 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 950 + 419 = 1369 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 59 × 63 = 3717 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 76 × 84 = 6387 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 806 + 167 = 973 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 426 + 290 = 716 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 21 × 12 = 252 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 12 × 38 = 456 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 50 × 92 = 4600 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 549 + 345 = 903 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 607 + 105 = 712 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 208 + 230 = 439 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 66 × 20 = 1320 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 783 + 683 = 1460 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 146 + 629 = 767 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 183 + 590 = 773 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 335 + 677 = 1012 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 67 × 91 = 6097 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 48 × 87 = 4176 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 83 × 40 = 3320 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 251 + 864 = 1115 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 36 × 79 = 2844 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 97 × 83 = 8051 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 81 × 83 = 6718 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 29 × 25 = 718 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 82 × 22 = 1802 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 61 × 83 = 5062 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 856 + 272 = 1122 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 36 × 14 = 495 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 21 × 98 = 2059 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 27 × 75 = 2026 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 519 + 931 = 1450 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 41 × 57 = 2337 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 58 × 71 = 4127 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 12 × 79 = 950 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 39 × 34 = 1321 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 997 + 712 = 1705 right or wrong? (a) Right (b) Wrong

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