Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 209 · 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 53 × 18 = 954 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 72 × 33 = 2370 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 264 + 204 = 468 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 817 + 328 = 1145 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 38 × 45 = 1711 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 267 + 916 = 1182 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 76 × 75 = 5708 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 20 × 80 = 1600 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 19 × 37 = 709 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 580 + 190 = 778 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 96 × 20 = 1920 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 46 × 42 = 1932 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 75 × 86 = 6449 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 19 × 42 = 799 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 18 × 45 = 810 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 127 + 898 = 1025 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 84 × 14 = 1176 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 180 + 209 = 389 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 89 × 16 = 1424 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 213 + 141 = 360 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 161 + 144 = 305 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 902 + 484 = 1388 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 55 × 75 = 4128 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 550 + 158 = 708 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 88 × 51 = 4488 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 94 × 89 = 8369 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 323 + 240 = 563 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 19 × 58 = 1102 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 61 × 41 = 2507 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 888 + 283 = 1172 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 27 × 61 = 1647 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 986 + 105 = 1091 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 891 + 890 = 1786 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 837 + 955 = 1801 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 79 × 90 = 7109 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 776 + 569 = 1352 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 964 + 224 = 1188 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 632 + 107 = 747 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 22 × 19 = 421 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 358 + 402 = 755 right or wrong? (a) Right (b) Wrong

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