Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 603 · 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 35 × 20 = 700 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 26 × 22 = 567 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 32 × 56 = 1792 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 15 × 18 = 270 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 33 × 71 = 2343 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 82 × 89 = 7290 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 317 + 153 = 470 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 94 × 98 = 9217 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 66 × 61 = 4026 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 66 × 60 = 3960 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 13 × 16 = 211 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 353 + 996 = 1349 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 856 + 247 = 1097 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 26 × 81 = 2106 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 532 + 921 = 1453 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 193 + 652 = 845 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 226 + 628 = 854 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 59 × 55 = 3245 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 39 × 39 = 1521 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 92 × 84 = 7728 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 78 × 40 = 3111 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 71 × 84 = 5964 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 417 + 802 = 1219 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 524 + 198 = 726 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 195 + 117 = 321 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 61 × 28 = 1706 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 594 + 341 = 935 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 214 + 983 = 1190 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 24 × 71 = 1704 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 23 × 80 = 1834 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 145 + 976 = 1114 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 26 × 36 = 927 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 544 + 854 = 1401 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 716 + 313 = 1029 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 29 × 20 = 580 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 96 × 32 = 3063 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 29 × 15 = 435 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 431 + 460 = 900 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 18 × 19 = 342 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 64 × 82 = 5248 right or wrong? (a) Wrong (b) Right

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