Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 334 · 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 970 + 518 = 1489 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 29 × 15 = 438 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 164 + 798 = 969 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 238 + 272 = 510 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 81 × 33 = 2678 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 19 × 54 = 1034 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 31 × 96 = 2984 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 38 × 75 = 2850 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 31 × 50 = 1550 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 818 + 760 = 1569 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 445 + 654 = 1099 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 22 × 60 = 1317 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 169 + 479 = 648 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 923 + 821 = 1752 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 79 × 19 = 1501 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 471 + 842 = 1313 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 427 + 273 = 707 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 926 + 990 = 1923 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 704 + 300 = 1004 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 68 × 76 = 5165 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 64 × 78 = 4992 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 64 × 75 = 4800 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 26 × 14 = 367 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 86 × 29 = 2494 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 38 × 77 = 2926 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 62 × 63 = 3906 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 809 + 704 = 1518 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 949 + 250 = 1199 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 427 + 996 = 1423 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 382 + 875 = 1261 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 70 × 34 = 2379 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 687 + 887 = 1574 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 25 × 55 = 1367 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 314 + 639 = 953 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 105 + 203 = 310 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 64 × 46 = 2944 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 270 + 426 = 691 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 49 × 55 = 2693 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 259 + 567 = 826 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 28 × 97 = 2716 right or wrong? (a) Right (b) Wrong

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