Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 407 · 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 26 × 33 = 850 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 347 + 366 = 713 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 391 + 760 = 1150 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 31 × 16 = 496 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 399 + 647 = 1046 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 302 + 600 = 905 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 47 × 16 = 752 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 36 × 45 = 1620 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 15 × 30 = 446 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 95 × 73 = 6936 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 18 × 26 = 468 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 95 × 87 = 8265 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 33 × 81 = 2673 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 38 × 40 = 1522 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 34 × 75 = 2550 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 503 + 116 = 615 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 502 + 261 = 767 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 95 × 68 = 6454 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 14 × 31 = 434 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 171 + 163 = 334 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 62 × 84 = 5208 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 829 + 891 = 1713 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 39 × 44 = 1721 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 595 + 609 = 1206 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 60 × 65 = 3898 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 404 + 836 = 1235 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 94 × 34 = 3193 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 99 × 18 = 1782 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 22 × 34 = 745 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 33 × 30 = 993 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 36 × 95 = 3420 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 941 + 824 = 1765 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 142 + 578 = 722 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 87 × 57 = 4968 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 173 + 386 = 559 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 30 × 57 = 1710 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 737 + 933 = 1663 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 57 × 95 = 5415 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 426 + 603 = 1029 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 21 × 32 = 672 right or wrong? (a) Right (b) Wrong

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