Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 948 · 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 973 + 327 = 1300 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 764 + 858 = 1622 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 82 × 74 = 6066 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 79 × 79 = 6241 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 21 × 39 = 826 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 54 × 27 = 1458 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 24 × 74 = 1771 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 26 × 74 = 1924 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 801 + 557 = 1356 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 32 × 40 = 1272 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 57 × 43 = 2451 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 657 + 663 = 1329 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 52 × 72 = 3753 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 318 + 308 = 617 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 22 × 15 = 330 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 187 + 847 = 1027 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 789 + 337 = 1134 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 99 × 79 = 7821 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 695 + 901 = 1587 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 185 + 949 = 1134 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 423 + 663 = 1085 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 84 × 17 = 1428 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 98 × 72 = 7057 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 915 + 729 = 1637 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 821 + 308 = 1125 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 66 × 88 = 5803 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 88 × 77 = 6785 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 34 × 88 = 2992 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 333 + 536 = 869 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 63 × 24 = 1512 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 231 + 251 = 482 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 57 × 77 = 4389 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 148 + 277 = 424 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 30 × 43 = 1285 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 359 + 536 = 893 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 707 + 911 = 1621 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 95 × 14 = 1324 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 15 × 60 = 900 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 24 × 41 = 980 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 524 + 467 = 984 right or wrong? (a) Right (b) Wrong

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