Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 322 · 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 74 × 13 = 969 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 77 × 47 = 3613 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 29 × 70 = 2030 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 40 × 19 = 760 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 653 + 576 = 1229 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 37 × 62 = 2300 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 37 × 60 = 2214 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 599 + 484 = 1083 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 43 × 51 = 2193 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 139 + 880 = 1019 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 12 × 26 = 312 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 42 × 96 = 4023 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 86 × 93 = 8001 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 206 + 656 = 864 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 498 + 999 = 1493 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 36 × 31 = 1112 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 70 × 59 = 4130 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 77 × 67 = 5158 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 888 + 607 = 1495 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 417 + 253 = 670 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 795 + 224 = 1019 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 84 × 63 = 5296 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 265 + 660 = 922 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 85 × 95 = 8075 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 82 × 99 = 8121 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 24 × 87 = 2088 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 899 + 945 = 1838 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 39 × 45 = 1755 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 92 × 30 = 2760 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 17 × 84 = 1434 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 327 + 760 = 1096 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 25 × 83 = 2070 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 56 × 88 = 4928 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 74 × 50 = 3700 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 63 × 61 = 3839 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 122 + 183 = 308 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 120 + 967 = 1090 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 843 + 337 = 1188 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 571 + 575 = 1146 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 78 × 33 = 2582 right or wrong? (a) Wrong (b) Right

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