Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 990 · 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 29 × 72 = 2087 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 79 × 67 = 5293 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 48 × 68 = 3272 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 41 × 31 = 1273 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 61 × 61 = 3728 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 90 × 16 = 1440 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 501 + 779 = 1276 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 643 + 927 = 1575 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 691 + 349 = 1040 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 22 × 68 = 1498 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 960 + 173 = 1133 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 38 × 59 = 2242 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 40 × 62 = 2479 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 30 × 59 = 1761 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 368 + 253 = 621 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 30 × 31 = 930 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 28 × 19 = 532 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 52 × 83 = 4310 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 444 + 972 = 1423 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 78 × 13 = 1006 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 908 + 478 = 1386 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 487 + 954 = 1437 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 66 × 25 = 1646 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 563 + 335 = 906 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 443 + 733 = 1168 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 816 + 192 = 1002 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 291 + 824 = 1115 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 66 × 99 = 6538 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 666 + 301 = 958 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 398 + 682 = 1075 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 796 + 463 = 1264 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 503 + 805 = 1308 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 19 × 17 = 325 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 43 × 17 = 731 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 224 + 193 = 417 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 68 × 62 = 4216 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 877 + 419 = 1290 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 538 + 736 = 1274 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 394 + 667 = 1061 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 98 × 73 = 7154 right or wrong? (a) Wrong (b) Right

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