Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 325 · 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 192 + 306 = 502 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 47 × 17 = 807 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 55 × 43 = 2365 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 58 × 50 = 2900 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 55 × 21 = 1157 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 201 + 623 = 824 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 64 × 19 = 1222 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 87 × 75 = 6529 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 213 + 196 = 409 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 216 + 721 = 937 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 712 + 315 = 1019 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 482 + 194 = 667 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 56 × 52 = 2905 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 954 + 335 = 1289 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 19 × 18 = 337 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 80 × 57 = 4560 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 190 + 924 = 1114 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 787 + 174 = 970 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 36 × 31 = 1116 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 39 × 49 = 1911 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 20 × 34 = 680 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 138 + 831 = 969 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 590 + 770 = 1360 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 366 + 705 = 1078 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 660 + 479 = 1139 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 950 + 586 = 1540 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 67 × 49 = 3283 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 99 × 37 = 3663 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 844 + 290 = 1133 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 437 + 143 = 580 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 54 × 13 = 700 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 98 × 99 = 9702 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 789 + 744 = 1533 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 33 × 48 = 1592 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 624 + 826 = 1450 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 753 + 182 = 935 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 706 + 215 = 921 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 23 × 78 = 1794 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 23 × 71 = 1633 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 945 + 544 = 1489 right or wrong? (a) Wrong (b) Right

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