Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 26 · 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 502 + 906 = 1403 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 50 × 65 = 3250 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 700 + 632 = 1332 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 243 + 755 = 991 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 78 × 55 = 4290 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 824 + 730 = 1552 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 42 × 45 = 1888 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 809 + 765 = 1574 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 173 + 390 = 563 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 648 + 353 = 1001 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 60 × 66 = 3969 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 19 × 30 = 565 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 28 × 37 = 1044 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 24 × 30 = 724 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 18 × 55 = 990 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 839 + 172 = 1017 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 59 × 96 = 5664 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 861 + 456 = 1326 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 529 + 313 = 844 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 17 × 89 = 1513 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 865 + 815 = 1680 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 497 + 645 = 1142 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 444 + 847 = 1291 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 53 × 20 = 1060 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 261 + 192 = 450 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 604 + 678 = 1285 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 28 × 66 = 1847 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 904 + 585 = 1489 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 939 + 649 = 1588 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 306 + 712 = 1018 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 63 × 85 = 5354 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 52 × 70 = 3640 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 24 × 56 = 1344 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 575 + 495 = 1066 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 725 + 558 = 1283 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 239 + 743 = 974 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 37 × 29 = 1073 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 39 × 38 = 1482 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 87 × 70 = 6090 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 856 + 259 = 1115 right or wrong? (a) Wrong (b) Right

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