Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 831 · 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 93 × 88 = 8184 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 31 × 50 = 1550 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 67 × 52 = 3484 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 497 + 346 = 843 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 55 × 99 = 5445 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 154 + 255 = 417 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 58 × 17 = 987 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 380 + 619 = 999 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 57 × 35 = 1995 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 91 × 16 = 1453 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 992 + 517 = 1509 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 973 + 575 = 1552 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 34 × 23 = 782 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 384 + 327 = 707 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 86 × 32 = 2748 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 903 + 980 = 1879 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 26 × 59 = 1534 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 832 + 982 = 1809 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 83 × 25 = 2075 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 35 × 32 = 1123 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 174 + 178 = 352 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 55 × 22 = 1210 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 67 × 15 = 1014 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 97 × 12 = 1164 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 131 + 739 = 870 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 91 × 75 = 6825 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 74 × 12 = 888 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 809 + 133 = 942 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 611 + 936 = 1556 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 25 × 63 = 1575 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 555 + 277 = 827 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 75 × 43 = 3218 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 66 × 19 = 1249 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 506 + 711 = 1224 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 82 × 90 = 7374 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 560 + 724 = 1289 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 17 × 44 = 757 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 352 + 394 = 746 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 57 × 47 = 2679 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 812 + 140 = 952 right or wrong? (a) Wrong (b) Right

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