Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 897 · 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 75 × 60 = 4500 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 49 × 79 = 3863 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 44 × 91 = 4004 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 124 + 283 = 411 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 72 × 34 = 2448 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 547 + 131 = 674 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 191 + 801 = 986 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 222 + 208 = 430 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 135 + 780 = 912 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 221 + 243 = 456 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 67 × 96 = 6427 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 266 + 226 = 493 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 393 + 379 = 772 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 65 × 95 = 6175 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 214 + 822 = 1036 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 912 + 786 = 1703 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 157 + 565 = 722 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 51 × 99 = 5049 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 65 × 69 = 4484 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 36 × 30 = 1080 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 377 + 199 = 576 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 473 + 909 = 1382 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 37 × 46 = 1704 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 833 + 401 = 1230 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 61 × 58 = 3538 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 63 × 74 = 4665 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 51 × 13 = 663 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 70 × 30 = 2100 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 31 × 17 = 527 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 14 × 99 = 1386 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 196 + 418 = 614 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 121 + 924 = 1037 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 136 + 942 = 1084 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 23 × 55 = 1265 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 56 × 67 = 3761 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 20 × 92 = 1840 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 75 × 94 = 7042 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 307 + 119 = 426 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 25 × 93 = 2325 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 617 + 783 = 1400 right or wrong? (a) Right (b) Wrong

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