Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 385 · 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 68 × 18 = 1224 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 660 + 153 = 819 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 276 + 686 = 959 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 88 × 27 = 2376 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 18 × 76 = 1359 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 16 × 66 = 1056 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 903 + 568 = 1470 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 32 × 51 = 1635 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 91 × 58 = 5278 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 28 × 47 = 1325 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 420 + 525 = 950 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 546 + 496 = 1042 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 651 + 734 = 1385 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 17 × 34 = 587 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 350 + 963 = 1313 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 869 + 977 = 1851 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 839 + 712 = 1556 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 88 × 20 = 1760 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 64 × 74 = 4736 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 74 × 21 = 1554 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 46 × 89 = 4098 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 55 × 29 = 1594 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 676 + 449 = 1125 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 91 × 31 = 2813 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 230 + 195 = 421 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 640 + 596 = 1228 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 21 × 99 = 2070 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 666 + 932 = 1598 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 63 × 57 = 3591 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 816 + 893 = 1716 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 741 + 144 = 885 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 29 × 98 = 2844 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 273 + 486 = 759 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 41 × 81 = 3321 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 162 + 110 = 277 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 701 + 238 = 939 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 222 + 459 = 688 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 45 × 51 = 2290 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 526 + 455 = 981 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 75 × 85 = 6378 right or wrong? (a) Wrong (b) Right

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