Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 517 · 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 94 × 34 = 3196 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 42 × 25 = 1050 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 51 × 67 = 3417 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 659 + 774 = 1430 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 806 + 106 = 917 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 29 × 18 = 522 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 97 × 46 = 4457 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 45 × 13 = 585 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 63 × 78 = 4914 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 83 × 15 = 1245 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 35 × 87 = 3045 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 305 + 576 = 880 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 262 + 164 = 425 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 754 + 841 = 1599 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 876 + 374 = 1250 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 18 × 76 = 1370 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 161 + 210 = 371 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 73 × 40 = 2920 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 315 + 787 = 1102 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 39 × 48 = 1867 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 724 + 597 = 1321 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 84 × 42 = 3528 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 385 + 841 = 1232 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 85 × 51 = 4326 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 700 + 421 = 1129 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 610 + 349 = 965 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 120 + 360 = 480 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 73 × 70 = 5110 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 536 + 201 = 737 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 27 × 86 = 2324 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 90 × 42 = 3780 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 26 × 12 = 312 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 30 × 79 = 2370 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 268 + 824 = 1092 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 709 + 369 = 1081 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 67 × 15 = 1007 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 754 + 286 = 1040 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 596 + 348 = 951 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 243 + 900 = 1143 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 477 + 136 = 617 right or wrong? (a) Wrong (b) Right

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