Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 284 · 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 124 + 785 = 903 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 521 + 835 = 1356 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 366 + 494 = 851 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 24 × 86 = 2064 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 19 × 98 = 1860 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 808 + 216 = 1024 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 42 × 92 = 3855 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 35 × 79 = 2765 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 871 + 692 = 1563 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 310 + 281 = 599 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 80 × 54 = 4325 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 73 × 12 = 870 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 187 + 669 = 856 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 377 + 427 = 806 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 25 × 27 = 675 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 637 + 344 = 973 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 98 × 84 = 8232 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 95 × 91 = 8643 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 48 × 41 = 1968 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 20 × 80 = 1600 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 221 + 109 = 330 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 684 + 491 = 1175 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 93 × 49 = 4557 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 312 + 738 = 1044 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 906 + 927 = 1833 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 22 × 15 = 338 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 203 + 991 = 1198 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 243 + 653 = 896 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 46 × 57 = 2624 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 225 + 615 = 840 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 83 × 15 = 1245 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 79 × 45 = 3547 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 366 + 552 = 924 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 647 + 286 = 933 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 273 + 580 = 857 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 74 × 26 = 1924 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 44 × 15 = 651 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 465 + 943 = 1408 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 31 × 12 = 374 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 278 + 431 = 718 right or wrong? (a) Wrong (b) Right

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