Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 293 · 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 397 + 959 = 1355 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 664 + 552 = 1216 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 174 + 721 = 903 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 659 + 822 = 1474 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 106 + 236 = 333 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 57 × 76 = 4332 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 941 + 223 = 1164 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 370 + 639 = 1009 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 616 + 352 = 968 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 692 + 533 = 1229 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 716 + 779 = 1493 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 25 × 70 = 1758 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 54 × 35 = 1890 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 236 + 195 = 440 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 778 + 914 = 1692 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 619 + 569 = 1192 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 53 × 39 = 2067 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 248 + 183 = 431 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 95 × 80 = 7598 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 659 + 845 = 1504 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 843 + 409 = 1252 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 57 × 96 = 5472 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 400 + 735 = 1135 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 566 + 239 = 805 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 56 × 35 = 1960 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 874 + 222 = 1096 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 21 × 42 = 882 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 652 + 435 = 1087 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 76 × 39 = 2964 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 706 + 297 = 1003 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 334 + 919 = 1244 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 18 × 88 = 1584 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 40 × 25 = 1008 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 228 + 993 = 1221 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 742 + 472 = 1221 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 25 × 56 = 1398 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 45 × 69 = 3105 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 19 × 40 = 760 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 428 + 367 = 795 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 970 + 580 = 1550 right or wrong? (a) Right (b) Wrong

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