Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 699 · 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 90 × 55 = 4950 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 49 × 63 = 3084 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 27 × 24 = 651 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 36 × 29 = 1053 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 98 × 14 = 1367 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 43 × 25 = 1075 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 682 + 257 = 939 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 55 × 34 = 1870 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 912 + 243 = 1154 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 57 × 54 = 3074 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 643 + 976 = 1615 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 60 × 80 = 4805 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 528 + 528 = 1050 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 38 × 36 = 1368 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 84 × 25 = 2100 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 56 × 21 = 1178 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 55 × 36 = 1980 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 36 × 81 = 2916 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 695 + 541 = 1233 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 48 × 15 = 720 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 312 + 999 = 1319 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 74 × 78 = 5772 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 36 × 80 = 2880 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 178 + 932 = 1117 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 309 + 948 = 1257 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 313 + 321 = 634 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 192 + 212 = 404 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 76 × 64 = 4864 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 967 + 919 = 1892 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 805 + 222 = 1021 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 18 × 22 = 395 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 32 × 40 = 1280 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 84 × 91 = 7644 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 43 × 75 = 3223 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 835 + 457 = 1292 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 85 × 35 = 2974 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 201 + 651 = 854 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 35 × 44 = 1532 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 43 × 80 = 3449 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 702 + 511 = 1220 right or wrong? (a) Wrong (b) Right

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