Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 491 · 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 212 + 815 = 1036 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 19 × 27 = 509 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 714 + 838 = 1551 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 902 + 430 = 1332 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 151 + 290 = 441 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 19 × 24 = 449 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 74 × 97 = 7178 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 48 × 55 = 2640 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 218 + 707 = 925 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 965 + 586 = 1553 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 539 + 139 = 672 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 45 × 13 = 592 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 56 × 64 = 3584 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 754 + 418 = 1172 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 42 × 98 = 4116 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 401 + 291 = 693 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 470 + 602 = 1072 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 20 × 77 = 1540 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 24 × 59 = 1407 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 946 + 271 = 1217 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 821 + 211 = 1031 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 106 + 721 = 827 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 129 + 271 = 403 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 70 × 36 = 2520 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 59 × 88 = 5192 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 40 × 63 = 2520 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 27 × 15 = 405 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 91 × 69 = 6273 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 25 × 22 = 543 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 344 + 232 = 576 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 728 + 274 = 998 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 356 + 193 = 553 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 58 × 90 = 5229 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 759 + 710 = 1469 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 870 + 413 = 1283 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 303 + 601 = 906 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 898 + 811 = 1704 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 66 × 15 = 990 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 27 × 22 = 594 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 892 + 248 = 1140 right or wrong? (a) Wrong (b) Right

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