Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 157 · 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 95 × 43 = 4085 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 38 × 66 = 2508 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 372 + 202 = 565 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 441 + 129 = 570 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 68 × 61 = 4150 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 82 × 75 = 6153 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 36 × 13 = 466 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 199 + 829 = 1020 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 20 × 30 = 598 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 21 × 71 = 1500 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 64 × 58 = 3712 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 41 × 69 = 2829 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 139 + 637 = 776 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 206 + 858 = 1064 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 335 + 447 = 791 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 74 × 16 = 1193 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 34 × 31 = 1059 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 41 × 37 = 1520 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 835 + 342 = 1170 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 219 + 119 = 338 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 69 × 43 = 2972 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 20 × 56 = 1120 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 54 × 18 = 970 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 58 × 18 = 1044 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 42 × 57 = 2394 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 57 × 97 = 5529 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 71 × 86 = 6106 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 16 × 42 = 672 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 441 + 118 = 553 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 655 + 367 = 1025 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 27 × 91 = 2455 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 28 × 97 = 2716 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 59 × 15 = 884 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 28 × 49 = 1370 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 548 + 161 = 709 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 355 + 454 = 809 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 328 + 544 = 869 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 67 × 68 = 4556 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 348 + 115 = 457 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 179 + 203 = 382 right or wrong? (a) Right (b) Wrong

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