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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 813 · 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. 2.16 × 8 =
  3. 3.47 × 4 =
  4. 4.49 × 4 =
  5. 5.24 × 8 =
  6. 6.14 × 8 =
  7. 7.65 × 4 =
  8. 8.70 × 4 =
  9. 9.12 × 8 =
  10. 10.59 × 4 =
  11. 11.22 × 8 =
  12. 12.67 × 4 =
  13. 13.41 × 4 =
  14. 14.40 × 8 =
  15. 15.50 × 4 =
  16. 16.46 × 4 =
  17. 17.33 × 4 =
  18. 18.29 × 4 =
  19. 19.36 × 8 =
  20. 20.40 × 4 =
  21. 21.17 × 8 =
  22. 22.12 × 4 =
  23. 23.15 × 4 =
  24. 24.55 × 4 =
  25. 25.31 × 8 =
  26. 26.20 × 8 =
  27. 27.44 × 4 =
  28. 28.18 × 8 =
  29. 29.39 × 8 =
  30. 30.30 × 4 =
  31. 31.51 × 4 =
  32. 32.32 × 8 =
  33. 33.15 × 8 =
  34. 34.19 × 8 =
  35. 35.60 × 4 =
  36. 36.28 × 8 =
  37. 37.33 × 8 =
  38. 38.56 × 4 =
  39. 39.31 × 4 =
  40. 40.18 × 4 =

Answer key

  1. 84
  2. 128
  3. 188
  4. 196
  5. 192
  6. 112
  7. 260
  8. 280
  9. 96
  10. 236
  11. 176
  12. 268
  13. 164
  14. 320
  15. 200
  16. 184
  17. 132
  18. 116
  19. 288
  20. 160
  21. 136
  22. 48
  23. 60
  24. 220
  25. 248
  26. 160
  27. 176
  28. 144
  29. 312
  30. 120
  31. 204
  32. 256
  33. 120
  34. 152
  35. 240
  36. 224
  37. 264
  38. 224
  39. 124
  40. 72

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