Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 912 · 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 77 × 35 = 2691 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 54 × 35 = 1898 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 277 + 483 = 760 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 56 × 98 = 5488 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 542 + 722 = 1257 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 93 × 84 = 7810 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 33 × 22 = 729 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 743 + 999 = 1743 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 725 + 127 = 848 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 47 × 75 = 3525 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 437 + 900 = 1343 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 954 + 654 = 1617 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 958 + 666 = 1624 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 79 × 81 = 6404 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 92 × 51 = 4692 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 175 + 248 = 423 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 583 + 339 = 922 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 48 × 88 = 4233 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 95 × 15 = 1421 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 115 + 868 = 981 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 28 × 32 = 896 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 23 × 60 = 1371 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 172 + 973 = 1145 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 74 × 17 = 1249 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 57 × 34 = 1944 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 208 + 679 = 887 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 21 × 19 = 399 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 90 × 74 = 6655 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 549 + 806 = 1355 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 90 × 53 = 4770 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 74 × 80 = 5921 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 49 × 74 = 3629 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 212 + 152 = 367 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 191 + 143 = 334 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 65 × 37 = 2405 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 73 × 76 = 5548 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 266 + 663 = 929 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 75 × 30 = 2249 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 49 × 86 = 4214 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 265 + 244 = 517 right or wrong? (a) Wrong (b) Right

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