Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 652 · 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 91 × 33 = 3003 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 86 × 28 = 2408 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 325 + 290 = 615 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 362 + 570 = 923 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 35 × 54 = 1886 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 859 + 179 = 1039 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 20 × 23 = 467 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 79 × 87 = 6873 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 751 + 668 = 1419 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 34 × 59 = 2006 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 66 × 51 = 3369 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 163 + 960 = 1123 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 71 × 43 = 3055 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 44 × 34 = 1490 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 972 + 599 = 1569 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 45 × 77 = 3464 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 311 + 733 = 1044 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 306 + 889 = 1198 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 140 + 240 = 373 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 959 + 708 = 1667 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 841 + 320 = 1161 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 208 + 872 = 1073 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 79 × 67 = 5293 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 349 + 328 = 680 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 38 × 19 = 722 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 63 × 82 = 5157 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 23 × 12 = 276 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 36 × 53 = 1916 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 73 × 92 = 6708 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 19 × 53 = 1007 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 23 × 54 = 1242 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 59 × 33 = 1947 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 274 + 232 = 498 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 81 × 16 = 1296 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 898 + 875 = 1773 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 575 + 168 = 743 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 541 + 810 = 1351 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 63 × 84 = 5292 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 39 × 26 = 1014 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 702 + 409 = 1111 right or wrong? (a) Wrong (b) Right

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