Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 712 · 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 607 + 650 = 1257 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 28 × 79 = 2212 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 90 × 15 = 1350 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 12 × 24 = 288 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 53 × 41 = 2173 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 24 × 35 = 840 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 977 + 443 = 1420 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 753 + 177 = 930 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 136 + 378 = 514 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 674 + 804 = 1470 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 78 × 42 = 3274 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 91 × 60 = 5468 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 69 × 69 = 4761 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 29 × 55 = 1595 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 877 + 823 = 1693 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 18 × 50 = 900 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 79 × 82 = 6474 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 40 × 52 = 2087 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 74 × 27 = 1998 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 97 × 81 = 7858 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 71 × 83 = 5893 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 31 × 83 = 2573 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 38 × 90 = 3418 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 79 × 33 = 2601 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 185 + 283 = 469 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 63 × 32 = 2025 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 119 + 832 = 952 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 93 × 69 = 6417 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 47 × 62 = 2914 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 68 × 39 = 2652 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 98 × 31 = 3029 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 25 × 74 = 1850 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 558 + 832 = 1384 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 32 × 97 = 3104 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 98 × 29 = 2836 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 538 + 868 = 1406 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 968 + 348 = 1316 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 228 + 238 = 466 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 95 × 29 = 2755 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 79 × 55 = 4345 right or wrong? (a) Right (b) Wrong

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