Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 313 · 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 15 × 93 = 1395 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 38 × 44 = 1674 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 702 + 472 = 1174 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 37 × 79 = 2923 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 25 × 30 = 758 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 766 + 183 = 949 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 60 × 70 = 4200 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 24 × 52 = 1248 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 84 × 48 = 4032 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 699 + 595 = 1294 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 954 + 122 = 1076 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 49 × 81 = 3969 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 23 × 98 = 2256 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 83 × 83 = 6889 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 90 × 96 = 8640 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 79 × 41 = 3239 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 491 + 935 = 1426 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 110 + 610 = 720 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 93 × 22 = 2050 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 75 × 53 = 3975 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 766 + 360 = 1126 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 289 + 111 = 400 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 34 × 91 = 3093 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 124 + 192 = 312 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 505 + 107 = 610 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 75 × 59 = 4425 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 92 × 44 = 4048 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 228 + 738 = 959 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 354 + 767 = 1121 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 694 + 870 = 1558 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 936 + 525 = 1461 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 61 × 52 = 3172 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 486 + 313 = 801 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 20 × 74 = 1480 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 525 + 607 = 1132 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 437 + 443 = 880 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 911 + 775 = 1680 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 197 + 210 = 407 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 40 × 49 = 1958 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 75 × 32 = 2400 right or wrong? (a) Right (b) Wrong

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