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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 18 · 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. 1.16 × 8 =
  2. 2.35 × 8 =
  3. 3.17 × 8 =
  4. 4.69 × 4 =
  5. 5.46 × 4 =
  6. 6.28 × 8 =
  7. 7.63 × 4 =
  8. 8.44 × 4 =
  9. 9.67 × 4 =
  10. 10.32 × 8 =
  11. 11.36 × 4 =
  12. 12.14 × 8 =
  13. 13.33 × 8 =
  14. 14.73 × 4 =
  15. 15.25 × 8 =
  16. 16.19 × 8 =
  17. 17.38 × 8 =
  18. 18.34 × 8 =
  19. 19.22 × 8 =
  20. 20.26 × 4 =
  21. 21.21 × 4 =
  22. 22.72 × 4 =
  23. 23.33 × 4 =
  24. 24.62 × 4 =
  25. 25.28 × 4 =
  26. 26.29 × 8 =
  27. 27.31 × 8 =
  28. 28.47 × 4 =
  29. 29.18 × 4 =
  30. 30.24 × 8 =
  31. 31.30 × 4 =
  32. 32.22 × 4 =
  33. 33.49 × 4 =
  34. 34.39 × 8 =
  35. 35.54 × 4 =
  36. 36.74 × 4 =
  37. 37.66 × 4 =
  38. 38.64 × 4 =
  39. 39.25 × 4 =
  40. 40.43 × 4 =

Answer key

  1. 128
  2. 280
  3. 136
  4. 276
  5. 184
  6. 224
  7. 252
  8. 176
  9. 268
  10. 256
  11. 144
  12. 112
  13. 264
  14. 292
  15. 200
  16. 152
  17. 304
  18. 272
  19. 176
  20. 104
  21. 84
  22. 288
  23. 132
  24. 248
  25. 112
  26. 232
  27. 248
  28. 188
  29. 72
  30. 192
  31. 120
  32. 88
  33. 196
  34. 312
  35. 216
  36. 296
  37. 264
  38. 256
  39. 100
  40. 172

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