Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 931 · 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 33 × 15 = 503 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 48 × 50 = 2406 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 99 × 27 = 2673 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 997 + 654 = 1651 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 68 × 12 = 823 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 15 × 80 = 1200 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 27 × 84 = 2268 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 830 + 507 = 1337 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 34 × 26 = 891 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 953 + 317 = 1270 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 22 × 35 = 770 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 976 + 563 = 1531 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 90 × 12 = 1080 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 625 + 555 = 1180 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 73 × 88 = 6421 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 675 + 120 = 795 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 80 × 29 = 2311 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 87 × 26 = 2262 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 71 × 35 = 2489 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 26 × 37 = 962 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 221 + 699 = 920 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 695 + 482 = 1177 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 491 + 265 = 756 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 939 + 851 = 1792 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 61 × 21 = 1281 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 47 × 40 = 1879 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 991 + 161 = 1151 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 313 + 503 = 816 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 501 + 425 = 926 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 754 + 776 = 1530 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 440 + 613 = 1059 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 983 + 948 = 1931 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 112 + 728 = 831 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 197 + 665 = 869 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 63 × 53 = 3346 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 95 × 36 = 3420 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 485 + 225 = 710 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 97 × 56 = 5432 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 65 × 88 = 5711 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 514 + 460 = 973 right or wrong? (a) Wrong (b) Right

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