Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 291 · 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 626 + 377 = 995 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 941 + 717 = 1658 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 315 + 390 = 705 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 16 × 97 = 1552 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 43 × 95 = 4085 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 54 × 62 = 3348 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 543 + 557 = 1100 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 153 + 319 = 472 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 790 + 961 = 1746 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 31 × 69 = 2139 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 723 + 479 = 1202 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 923 + 692 = 1620 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 12 × 73 = 876 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 731 + 466 = 1197 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 66 × 85 = 5607 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 53 × 92 = 4876 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 32 × 63 = 2015 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 808 + 623 = 1431 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 45 × 91 = 4090 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 80 × 60 = 4809 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 289 + 509 = 805 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 874 + 125 = 1007 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 167 + 212 = 385 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 35 × 83 = 2905 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 22 × 67 = 1474 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 662 + 303 = 965 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 97 × 80 = 7760 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 69 × 96 = 6624 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 328 + 481 = 815 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 13 × 73 = 949 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 306 + 781 = 1087 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 179 + 592 = 777 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 78 × 74 = 5767 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 563 + 595 = 1158 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 994 + 291 = 1288 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 310 + 636 = 949 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 261 + 957 = 1218 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 47 × 74 = 3482 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 57 × 15 = 855 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 73 × 79 = 5767 right or wrong? (a) Right (b) Wrong

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