Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 247 · 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 947 + 321 = 1267 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 19 × 34 = 646 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 96 × 85 = 8160 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 40 × 63 = 2528 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 308 + 556 = 864 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 16 × 71 = 1136 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 299 + 617 = 920 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 12 × 62 = 737 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 21 × 97 = 2032 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 206 + 188 = 401 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 492 + 970 = 1462 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 936 + 144 = 1077 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 116 + 136 = 260 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 36 × 12 = 432 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 94 × 12 = 1131 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 924 + 917 = 1841 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 75 × 81 = 6076 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 713 + 849 = 1562 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 281 + 143 = 427 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 936 + 491 = 1424 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 920 + 754 = 1674 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 717 + 506 = 1223 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 85 × 24 = 2031 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 397 + 499 = 896 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 37 × 88 = 3256 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 519 + 547 = 1057 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 59 × 45 = 2655 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 565 + 278 = 843 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 21 × 59 = 1239 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 32 × 37 = 1184 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 75 × 17 = 1275 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 51 × 15 = 765 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 429 + 158 = 587 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 346 + 895 = 1242 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 996 + 753 = 1747 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 64 × 34 = 2175 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 405 + 483 = 888 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 756 + 872 = 1628 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 51 × 90 = 4592 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 679 + 233 = 912 right or wrong? (a) Wrong (b) Right

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