Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 962 · 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 574 + 377 = 956 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 19 × 12 = 219 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 48 × 17 = 815 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 630 + 432 = 1056 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 70 × 44 = 3080 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 77 × 40 = 3074 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 50 × 55 = 2750 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 106 + 509 = 615 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 68 × 36 = 2441 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 797 + 992 = 1789 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 29 × 43 = 1243 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 18 × 21 = 378 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 601 + 783 = 1391 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 968 + 765 = 1733 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 57 × 21 = 1205 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 16 × 67 = 1066 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 720 + 720 = 1431 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 542 + 178 = 720 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 48 × 61 = 2928 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 826 + 473 = 1291 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 98 × 22 = 2155 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 48 × 37 = 1776 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 64 × 74 = 4742 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 646 + 748 = 1402 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 116 + 459 = 575 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 69 × 41 = 2829 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 49 × 87 = 4258 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 18 × 42 = 755 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 92 × 68 = 6247 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 707 + 814 = 1512 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 84 × 27 = 2266 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 18 × 65 = 1169 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 17 × 67 = 1139 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 59 × 35 = 2072 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 365 + 231 = 596 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 837 + 417 = 1254 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 456 + 263 = 719 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 712 + 193 = 911 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 328 + 906 = 1234 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 27 × 82 = 2214 right or wrong? (a) Wrong (b) Right

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