Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 787 · 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 57 × 15 = 855 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 459 + 868 = 1327 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 229 + 367 = 596 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 947 + 275 = 1222 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 23 × 25 = 575 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 78 × 38 = 2962 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 863 + 181 = 1049 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 474 + 511 = 985 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 30 × 64 = 1920 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 37 × 49 = 1813 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 30 × 31 = 928 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 15 × 57 = 855 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 89 × 36 = 3204 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 40 × 42 = 1679 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 653 + 214 = 864 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 35 × 36 = 1260 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 99 × 12 = 1186 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 399 + 500 = 899 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 412 + 493 = 911 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 91 × 90 = 8190 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 22 × 13 = 286 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 904 + 867 = 1774 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 65 × 12 = 788 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 671 + 119 = 790 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 480 + 444 = 927 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 48 × 19 = 910 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 34 × 28 = 950 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 23 × 49 = 1127 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 375 + 132 = 508 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 15 × 86 = 1292 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 83 × 22 = 1825 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 47 × 70 = 3290 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 285 + 762 = 1044 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 715 + 256 = 968 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 75 × 14 = 1050 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 62 × 36 = 2241 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 88 × 47 = 4136 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 63 × 43 = 2709 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 98 × 69 = 6760 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 181 + 901 = 1082 right or wrong? (a) Wrong (b) Right

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