Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 648 · 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 702 + 186 = 888 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 84 × 73 = 6128 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 21 × 15 = 315 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 49 × 24 = 1176 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 46 × 41 = 1888 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 939 + 766 = 1705 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 94 × 48 = 4515 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 82 × 88 = 7216 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 602 + 430 = 1031 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 69 × 99 = 6835 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 65 × 40 = 2600 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 524 + 841 = 1367 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 13 × 69 = 897 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 43 × 64 = 2752 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 95 × 77 = 7309 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 98 × 27 = 2646 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 93 × 82 = 7629 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 54 × 64 = 3456 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 469 + 415 = 884 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 42 × 75 = 3150 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 84 × 18 = 1512 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 13 × 43 = 550 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 541 + 441 = 991 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 311 + 798 = 1109 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 896 + 930 = 1835 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 59 × 42 = 2478 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 519 + 916 = 1437 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 17 × 82 = 1394 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 777 + 229 = 1009 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 64 × 69 = 4414 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 773 + 684 = 1457 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 641 + 914 = 1551 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 530 + 940 = 1470 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 950 + 981 = 1925 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 67 × 95 = 6360 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 262 + 787 = 1055 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 310 + 924 = 1231 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 802 + 454 = 1249 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 37 × 87 = 3219 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 46 × 41 = 1878 right or wrong? (a) Wrong (b) Right

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