Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 622 · 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 47 × 81 = 3802 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 72 × 13 = 940 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 583 + 322 = 905 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 743 + 151 = 895 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 385 + 149 = 534 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 51 × 65 = 3312 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 26 × 80 = 2088 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 328 + 227 = 555 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 247 + 680 = 927 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 571 + 274 = 845 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 551 + 193 = 744 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 91 × 73 = 6643 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 515 + 332 = 847 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 657 + 196 = 854 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 990 + 759 = 1754 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 64 × 30 = 1920 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 49 × 47 = 2303 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 64 × 67 = 4290 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 73 × 62 = 4535 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 518 + 137 = 655 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 967 + 867 = 1834 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 488 + 327 = 815 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 74 × 90 = 6660 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 519 + 525 = 1048 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 750 + 659 = 1412 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 77 × 55 = 4231 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 64 × 81 = 5185 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 171 + 304 = 469 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 157 + 527 = 684 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 82 × 82 = 6724 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 13 × 87 = 1131 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 97 × 84 = 8148 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 85 × 44 = 3740 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 85 × 56 = 4760 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 274 + 449 = 716 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 12 × 18 = 218 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 47 × 56 = 2623 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 32 × 58 = 1856 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 465 + 568 = 1037 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 60 × 64 = 3840 right or wrong? (a) Wrong (b) Right

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