Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 777 · 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 43 × 56 = 2407 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 47 × 79 = 3713 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 167 + 777 = 941 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 262 + 172 = 434 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 165 + 357 = 522 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 316 + 555 = 864 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 999 + 725 = 1721 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 74 × 67 = 4949 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 73 × 81 = 5913 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 23 × 95 = 2185 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 91 × 52 = 4734 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 88 × 72 = 6336 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 96 × 90 = 8647 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 61 × 53 = 3233 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 77 × 61 = 4697 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 27 × 94 = 2538 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 181 + 258 = 434 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 65 × 50 = 3258 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 52 × 81 = 4221 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 37 × 82 = 3036 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 821 + 904 = 1725 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 32 × 23 = 729 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 530 + 755 = 1285 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 343 + 283 = 621 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 385 + 302 = 685 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 64 × 52 = 3335 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 122 + 922 = 1041 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 503 + 719 = 1221 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 273 + 127 = 401 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 308 + 669 = 982 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 769 + 189 = 958 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 77 × 14 = 1078 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 79 × 22 = 1738 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 20 × 92 = 1840 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 86 × 70 = 6025 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 28 × 88 = 2462 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 18 × 75 = 1353 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 90 × 56 = 5032 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 16 × 93 = 1479 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 311 + 886 = 1198 right or wrong? (a) Right (b) Wrong

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