Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 113 · 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 676 + 264 = 947 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 378 + 847 = 1224 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 782 + 254 = 1036 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 96 × 28 = 2695 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 51 × 36 = 1843 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 16 × 51 = 818 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 29 × 15 = 435 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 839 + 118 = 957 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 57 × 74 = 4218 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 54 × 57 = 3078 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 15 × 93 = 1399 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 31 × 19 = 589 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 41 × 45 = 1844 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 88 × 56 = 4923 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 90 × 34 = 3060 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 196 + 297 = 493 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 670 + 613 = 1276 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 96 × 68 = 6531 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 429 + 545 = 974 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 67 × 39 = 2620 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 223 + 989 = 1214 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 331 + 397 = 728 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 93 × 26 = 2422 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 947 + 852 = 1798 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 90 × 76 = 6838 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 382 + 310 = 692 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 56 × 23 = 1288 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 799 + 201 = 1000 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 35 × 26 = 910 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 54 × 17 = 918 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 74 × 91 = 6743 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 34 × 12 = 408 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 917 + 926 = 1846 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 13 × 80 = 1037 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 239 + 272 = 511 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 87 × 37 = 3214 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 942 + 316 = 1253 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 296 + 329 = 624 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 27 × 37 = 996 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 728 + 105 = 835 right or wrong? (a) Right (b) Wrong

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