Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 891 · 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 225 + 344 = 574 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 127 + 293 = 420 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 89 × 25 = 2225 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 446 + 281 = 729 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 71 × 58 = 4126 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 961 + 588 = 1547 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 90 × 90 = 8100 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 542 + 208 = 747 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 319 + 401 = 720 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 135 + 335 = 470 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 30 × 44 = 1320 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 95 × 68 = 6460 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 91 × 56 = 5096 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 81 × 73 = 5913 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 305 + 848 = 1153 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 967 + 586 = 1553 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 715 + 902 = 1617 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 964 + 274 = 1238 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 501 + 978 = 1480 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 64 × 43 = 2757 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 745 + 129 = 872 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 21 × 97 = 2037 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 376 + 620 = 989 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 44 × 75 = 3299 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 95 × 22 = 2090 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 750 + 293 = 1051 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 569 + 427 = 1003 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 802 + 901 = 1703 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 85 × 33 = 2805 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 15 × 25 = 384 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 916 + 899 = 1811 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 589 + 925 = 1514 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 37 × 30 = 1110 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 449 + 145 = 588 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 46 × 13 = 601 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 38 × 98 = 3724 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 15 × 60 = 896 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 732 + 987 = 1719 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 870 + 148 = 1018 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 667 + 160 = 827 right or wrong? (a) Wrong (b) Right

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