Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 24 · 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 55 × 93 = 5115 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 51 × 86 = 4386 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 298 + 132 = 430 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 245 + 848 = 1099 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 159 + 869 = 1028 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 23 × 76 = 1748 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 36 × 96 = 3458 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 813 + 584 = 1402 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 571 + 412 = 983 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 29 × 19 = 551 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 585 + 839 = 1415 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 96 × 13 = 1248 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 31 × 33 = 1026 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 22 × 14 = 312 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 27 × 65 = 1755 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 434 + 620 = 1054 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 59 × 90 = 5310 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 66 × 73 = 4818 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 521 + 137 = 651 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 744 + 937 = 1681 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 53 × 76 = 4028 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 29 × 13 = 377 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 45 × 16 = 725 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 14 × 45 = 637 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 99 × 53 = 5247 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 56 × 24 = 1350 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 310 + 759 = 1069 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 55 × 80 = 4405 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 82 × 88 = 7216 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 20 × 80 = 1594 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 288 + 750 = 1038 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 602 + 356 = 958 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 20 × 51 = 1020 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 752 + 332 = 1090 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 91 × 65 = 5915 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 917 + 754 = 1671 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 517 + 317 = 834 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 557 + 671 = 1228 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 34 × 28 = 952 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 300 + 341 = 641 right or wrong? (a) Wrong (b) Right

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