Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 294 · 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 52 × 56 = 2912 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 15 × 37 = 555 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 475 + 680 = 1147 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 31 × 38 = 1178 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 516 + 742 = 1257 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 66 × 71 = 4686 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 642 + 365 = 999 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 517 + 120 = 637 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 49 × 28 = 1367 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 664 + 640 = 1313 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 511 + 146 = 655 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 722 + 388 = 1107 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 821 + 856 = 1677 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 80 × 22 = 1760 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 87 × 37 = 3210 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 639 + 331 = 975 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 510 + 140 = 658 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 61 × 81 = 4941 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 21 × 44 = 924 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 354 + 168 = 522 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 54 × 89 = 4806 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 60 × 94 = 5636 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 44 × 37 = 1628 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 215 + 182 = 403 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 812 + 365 = 1184 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 209 + 578 = 787 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 41 × 84 = 3435 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 282 + 745 = 1027 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 56 × 37 = 2072 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 23 × 17 = 391 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 61 × 44 = 2684 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 32 × 48 = 1535 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 820 + 619 = 1439 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 589 + 455 = 1038 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 36 × 69 = 2479 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 805 + 535 = 1340 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 738 + 538 = 1276 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 92 × 23 = 2116 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 178 + 518 = 696 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 70 × 24 = 1680 right or wrong? (a) Wrong (b) Right

Free maths tricks lessons, practice and worksheets at talentjr.in/maths-tricks