Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 786 · 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 70 × 97 = 6790 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 92 × 40 = 3680 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 54 × 99 = 5349 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 41 × 34 = 1394 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 550 + 862 = 1412 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 310 + 202 = 511 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 401 + 670 = 1071 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 286 + 158 = 452 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 284 + 230 = 514 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 31 × 64 = 1984 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 803 + 178 = 977 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 68 × 20 = 1360 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 13 × 27 = 351 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 187 + 708 = 895 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 484 + 492 = 976 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 718 + 251 = 964 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 23 × 70 = 1610 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 24 × 70 = 1676 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 55 × 46 = 2539 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 677 + 871 = 1548 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 51 × 15 = 763 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 245 + 501 = 737 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 36 × 64 = 2304 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 76 × 38 = 2888 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 82 × 39 = 3200 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 85 × 76 = 6453 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 912 + 270 = 1182 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 829 + 794 = 1623 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 44 × 65 = 2860 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 793 + 578 = 1371 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 27 × 18 = 486 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 80 × 52 = 4156 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 70 × 44 = 3080 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 614 + 240 = 854 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 833 + 298 = 1131 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 57 × 35 = 1995 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 110 + 411 = 521 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 560 + 565 = 1133 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 79 × 26 = 2056 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 828 + 365 = 1196 right or wrong? (a) Wrong (b) Right

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