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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 782 · 40 questions
TalentJR

How to do it in your head (Double, double, double): × 2: double once. × 4: double, then double again. × 8: double three times.

NameDateTime takenScore ___ / 40
  1. 1.38 × 8 =
  2. 2.17 × 8 =
  3. 3.50 × 4 =
  4. 4.22 × 8 =
  5. 5.56 × 4 =
  6. 6.21 × 8 =
  7. 7.40 × 8 =
  8. 8.13 × 8 =
  9. 9.53 × 4 =
  10. 10.37 × 4 =
  11. 11.43 × 4 =
  12. 12.27 × 8 =
  13. 13.14 × 8 =
  14. 14.28 × 8 =
  15. 15.19 × 4 =
  16. 16.72 × 4 =
  17. 17.19 × 8 =
  18. 18.17 × 4 =
  19. 19.16 × 8 =
  20. 20.23 × 8 =
  21. 21.61 × 4 =
  22. 22.36 × 8 =
  23. 23.25 × 4 =
  24. 24.15 × 8 =
  25. 25.24 × 8 =
  26. 26.75 × 4 =
  27. 27.32 × 4 =
  28. 28.63 × 4 =
  29. 29.59 × 4 =
  30. 30.35 × 8 =
  31. 31.73 × 4 =
  32. 32.36 × 4 =
  33. 33.31 × 8 =
  34. 34.41 × 4 =
  35. 35.13 × 4 =
  36. 36.52 × 4 =
  37. 37.51 × 4 =
  38. 38.22 × 4 =
  39. 39.66 × 4 =
  40. 40.57 × 4 =

Answer key

  1. 304
  2. 136
  3. 200
  4. 176
  5. 224
  6. 168
  7. 320
  8. 104
  9. 212
  10. 148
  11. 172
  12. 216
  13. 112
  14. 224
  15. 76
  16. 288
  17. 152
  18. 68
  19. 128
  20. 184
  21. 244
  22. 288
  23. 100
  24. 120
  25. 192
  26. 300
  27. 128
  28. 252
  29. 236
  30. 280
  31. 292
  32. 144
  33. 248
  34. 164
  35. 52
  36. 208
  37. 204
  38. 88
  39. 264
  40. 228

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