Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 572 · 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 895 + 902 = 1797 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 900 + 598 = 1505 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 62 × 81 = 5014 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 582 + 810 = 1392 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 48 × 87 = 4176 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 677 + 838 = 1515 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 17 × 65 = 1106 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 29 × 35 = 1024 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 181 + 520 = 701 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 80 × 28 = 2236 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 62 × 53 = 3286 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 28 × 15 = 420 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 77 × 24 = 1848 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 34 × 58 = 1965 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 224 + 145 = 360 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 160 + 664 = 831 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 216 + 247 = 459 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 67 × 14 = 934 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 48 × 77 = 3692 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 92 × 56 = 5152 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 27 × 92 = 2485 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 928 + 332 = 1260 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 965 + 921 = 1886 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 93 × 61 = 5678 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 27 × 47 = 1272 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 692 + 387 = 1085 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 12 × 50 = 600 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 890 + 274 = 1173 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 587 + 821 = 1408 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 641 + 839 = 1479 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 74 × 18 = 1332 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 208 + 801 = 1017 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 810 + 569 = 1379 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 352 + 459 = 812 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 88 × 26 = 2291 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 32 × 69 = 2208 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 69 × 35 = 2420 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 15 × 41 = 623 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 63 × 76 = 4780 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 59 × 82 = 4841 right or wrong? (a) Wrong (b) Right

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