Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 584 · 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 77 × 29 = 2238 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 51 × 49 = 2499 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 21 × 52 = 1091 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 19 × 31 = 595 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 44 × 91 = 4004 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 628 + 929 = 1557 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 26 × 82 = 2132 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 370 + 706 = 1072 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 67 × 34 = 2286 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 240 + 765 = 1003 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 96 × 29 = 2784 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 588 + 108 = 696 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 24 × 94 = 2256 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 37 × 40 = 1481 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 60 × 85 = 5100 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 46 × 91 = 4186 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 969 + 619 = 1588 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 31 × 51 = 1584 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 613 + 894 = 1507 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 686 + 312 = 990 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 360 + 214 = 569 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 97 × 34 = 3300 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 33 × 17 = 557 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 661 + 542 = 1203 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 57 × 92 = 5244 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 87 × 74 = 6439 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 64 × 41 = 2616 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 365 + 858 = 1223 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 370 + 736 = 1105 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 161 + 814 = 980 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 644 + 417 = 1061 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 88 × 63 = 5552 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 29 × 59 = 1709 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 43 × 26 = 1111 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 435 + 352 = 795 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 96 × 53 = 5088 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 342 + 586 = 928 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 66 × 96 = 6336 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 971 + 259 = 1230 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 256 + 369 = 625 right or wrong? (a) Wrong (b) Right

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