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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 443 · 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. 1.21 × 4 =
  2. 2.35 × 8 =
  3. 3.59 × 4 =
  4. 4.39 × 8 =
  5. 5.54 × 4 =
  6. 6.32 × 8 =
  7. 7.22 × 8 =
  8. 8.41 × 4 =
  9. 9.34 × 8 =
  10. 10.33 × 4 =
  11. 11.20 × 8 =
  12. 12.31 × 8 =
  13. 13.38 × 8 =
  14. 14.14 × 8 =
  15. 15.75 × 4 =
  16. 16.19 × 8 =
  17. 17.23 × 8 =
  18. 18.30 × 4 =
  19. 19.36 × 8 =
  20. 20.40 × 8 =
  21. 21.63 × 4 =
  22. 22.42 × 4 =
  23. 23.18 × 8 =
  24. 24.24 × 4 =
  25. 25.13 × 8 =
  26. 26.16 × 8 =
  27. 27.16 × 4 =
  28. 28.29 × 8 =
  29. 29.28 × 8 =
  30. 30.45 × 4 =
  31. 31.37 × 8 =
  32. 32.71 × 4 =
  33. 33.35 × 4 =
  34. 34.23 × 4 =
  35. 35.31 × 4 =
  36. 36.28 × 4 =
  37. 37.26 × 8 =
  38. 38.36 × 4 =
  39. 39.57 × 4 =
  40. 40.40 × 4 =

Answer key

  1. 84
  2. 280
  3. 236
  4. 312
  5. 216
  6. 256
  7. 176
  8. 164
  9. 272
  10. 132
  11. 160
  12. 248
  13. 304
  14. 112
  15. 300
  16. 152
  17. 184
  18. 120
  19. 288
  20. 320
  21. 252
  22. 168
  23. 144
  24. 96
  25. 104
  26. 128
  27. 64
  28. 232
  29. 224
  30. 180
  31. 296
  32. 284
  33. 140
  34. 92
  35. 124
  36. 112
  37. 208
  38. 144
  39. 228
  40. 160

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