Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 848 · 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 688 + 992 = 1672 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 91 × 75 = 6825 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 916 + 213 = 1136 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 388 + 928 = 1308 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 86 × 96 = 8256 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 782 + 210 = 996 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 567 + 662 = 1227 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 580 + 887 = 1468 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 99 × 40 = 3960 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 19 × 74 = 1397 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 33 × 32 = 1056 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 58 × 39 = 2262 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 77 × 12 = 924 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 23 × 87 = 2001 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 63 × 92 = 5795 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 90 × 70 = 6300 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 34 × 71 = 2405 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 13 × 93 = 1209 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 616 + 646 = 1262 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 74 × 52 = 3848 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 46 × 88 = 4048 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 27 × 87 = 2357 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 152 + 602 = 754 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 644 + 839 = 1490 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 111 + 171 = 288 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 25 × 74 = 1851 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 67 × 48 = 3216 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 172 + 944 = 1116 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 50 × 55 = 2750 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 464 + 881 = 1338 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 243 + 269 = 512 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 70 × 80 = 5603 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 668 + 374 = 1042 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 786 + 738 = 1516 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 37 × 27 = 999 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 84 × 24 = 2016 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 16 × 91 = 1464 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 42 × 35 = 1470 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 249 + 339 = 588 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 214 + 888 = 1102 right or wrong? (a) Right (b) Wrong

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