Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 228 · 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 42 × 24 = 1008 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 734 + 815 = 1549 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 245 + 317 = 564 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 72 × 92 = 6624 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 90 × 79 = 7110 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 93 × 57 = 5307 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 47 × 33 = 1551 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 28 × 49 = 1372 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 31 × 26 = 806 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 888 + 733 = 1616 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 56 × 26 = 1456 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 225 + 108 = 333 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 63 × 67 = 4223 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 205 + 758 = 963 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 902 + 465 = 1371 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 927 + 215 = 1142 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 725 + 581 = 1306 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 36 × 50 = 1800 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 171 + 271 = 433 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 22 × 23 = 506 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 27 × 46 = 1242 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 28 × 43 = 1204 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 19 × 67 = 1278 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 797 + 180 = 977 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 955 + 640 = 1595 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 98 × 27 = 2644 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 332 + 736 = 1073 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 411 + 803 = 1212 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 524 + 192 = 716 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 55 × 86 = 4738 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 383 + 776 = 1156 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 557 + 171 = 730 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 35 × 29 = 1015 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 807 + 709 = 1516 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 14 × 65 = 910 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 503 + 880 = 1385 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 701 + 708 = 1403 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 60 × 51 = 3067 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 439 + 932 = 1372 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 24 × 90 = 2160 right or wrong? (a) Wrong (b) Right

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