Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 646 · 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 76 × 48 = 3648 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 35 × 20 = 700 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 139 + 466 = 605 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 213 + 425 = 638 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 57 × 28 = 1596 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 60 × 40 = 2407 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 981 + 692 = 1674 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 610 + 450 = 1057 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 53 × 26 = 1380 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 644 + 931 = 1575 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 370 + 705 = 1075 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 541 + 427 = 968 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 20 × 86 = 1720 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 23 × 63 = 1449 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 830 + 950 = 1776 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 83 × 61 = 5070 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 323 + 303 = 623 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 35 × 60 = 2100 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 567 + 194 = 761 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 25 × 18 = 450 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 512 + 411 = 923 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 65 × 75 = 4875 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 154 + 536 = 691 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 71 × 15 = 1065 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 637 + 136 = 773 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 986 + 993 = 1979 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 28 × 78 = 2187 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 228 + 120 = 348 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 54 × 17 = 918 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 167 + 719 = 882 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 96 × 74 = 7104 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 33 × 19 = 635 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 39 × 67 = 2616 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 88 × 35 = 3080 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 15 × 92 = 1380 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 581 + 671 = 1252 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 87 × 46 = 4002 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 295 + 344 = 639 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 13 × 13 = 178 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 125 + 118 = 243 right or wrong? (a) Right (b) Wrong

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