Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 208 · 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 98 × 79 = 7745 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 487 + 810 = 1288 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 818 + 485 = 1303 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 293 + 877 = 1170 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 57 × 93 = 5301 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 948 + 955 = 1903 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 944 + 540 = 1487 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 23 × 78 = 1791 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 158 + 951 = 1107 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 21 × 39 = 822 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 379 + 556 = 941 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 273 + 960 = 1239 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 322 + 599 = 921 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 26 × 16 = 409 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 293 + 581 = 874 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 95 × 24 = 2279 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 43 × 88 = 3777 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 56 × 12 = 671 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 486 + 770 = 1247 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 77 × 29 = 2228 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 23 × 54 = 1234 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 84 × 31 = 2604 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 405 + 536 = 933 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 98 × 53 = 5194 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 21 × 37 = 783 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 76 × 98 = 7448 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 18 × 59 = 1062 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 732 + 539 = 1271 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 16 × 51 = 816 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 332 + 706 = 1040 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 136 + 163 = 299 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 183 + 313 = 496 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 37 × 48 = 1776 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 737 + 626 = 1370 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 28 × 52 = 1454 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 44 × 96 = 4228 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 163 + 387 = 550 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 98 × 19 = 1865 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 13 × 92 = 1201 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 19 × 61 = 1159 right or wrong? (a) Wrong (b) Right

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