Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 613 · 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 401 + 802 = 1203 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 599 + 350 = 949 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 30 × 89 = 2665 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 206 + 814 = 1020 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 40 × 29 = 1163 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 371 + 363 = 732 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 75 × 62 = 4648 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 66 × 12 = 787 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 28 × 86 = 2408 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 342 + 155 = 496 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 206 + 419 = 625 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 527 + 497 = 1028 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 34 × 27 = 921 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 61 × 67 = 4087 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 142 + 538 = 680 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 57 × 84 = 4788 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 98 × 73 = 7161 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 58 × 88 = 5104 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 34 × 87 = 2958 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 955 + 167 = 1123 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 591 + 488 = 1079 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 71 × 23 = 1633 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 166 + 717 = 883 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 47 × 77 = 3619 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 557 + 820 = 1376 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 59 × 72 = 4241 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 555 + 374 = 938 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 27 × 75 = 2019 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 14 × 52 = 728 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 229 + 333 = 566 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 310 + 508 = 821 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 22 × 68 = 1496 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 447 + 543 = 992 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 51 × 59 = 3003 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 944 + 187 = 1131 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 606 + 757 = 1363 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 449 + 296 = 745 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 54 × 30 = 1626 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 97 × 91 = 8827 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 67 × 94 = 6298 right or wrong? (a) Wrong (b) Right

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