Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 643 · 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 651 + 527 = 1178 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 71 × 73 = 5186 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 33 × 49 = 1617 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 625 + 991 = 1616 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 82 × 69 = 5654 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 84 × 24 = 2018 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 296 + 734 = 1030 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 67 × 39 = 2605 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 66 × 36 = 2377 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 82 × 13 = 1066 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 84 × 70 = 5874 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 494 + 948 = 1441 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 26 × 20 = 520 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 928 + 310 = 1238 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 755 + 171 = 919 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 166 + 279 = 453 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 772 + 481 = 1245 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 88 × 31 = 2728 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 30 × 23 = 696 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 522 + 296 = 812 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 503 + 532 = 1040 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 24 × 51 = 1223 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 63 × 54 = 3406 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 59 × 25 = 1477 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 402 + 716 = 1114 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 376 + 354 = 735 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 49 × 17 = 830 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 65 × 41 = 2659 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 617 + 431 = 1044 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 359 + 284 = 643 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 46 × 92 = 4232 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 16 × 12 = 192 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 87 × 97 = 8439 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 58 × 49 = 2842 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 852 + 326 = 1185 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 44 × 94 = 4129 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 606 + 974 = 1571 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 95 × 72 = 6846 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 85 × 20 = 1700 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 99 × 41 = 4052 right or wrong? (a) Right (b) Wrong

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