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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 540 · 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. 1.55 × 4 =
  2. 2.24 × 8 =
  3. 3.31 × 4 =
  4. 4.22 × 8 =
  5. 5.13 × 8 =
  6. 6.25 × 8 =
  7. 7.72 × 4 =
  8. 8.32 × 8 =
  9. 9.29 × 8 =
  10. 10.36 × 8 =
  11. 11.34 × 8 =
  12. 12.43 × 4 =
  13. 13.17 × 8 =
  14. 14.50 × 4 =
  15. 15.61 × 4 =
  16. 16.64 × 4 =
  17. 17.24 × 4 =
  18. 18.18 × 8 =
  19. 19.40 × 8 =
  20. 20.67 × 4 =
  21. 21.49 × 4 =
  22. 22.14 × 8 =
  23. 23.33 × 4 =
  24. 24.14 × 4 =
  25. 25.39 × 8 =
  26. 26.21 × 8 =
  27. 27.29 × 4 =
  28. 28.34 × 4 =
  29. 29.25 × 4 =
  30. 30.33 × 8 =
  31. 31.70 × 4 =
  32. 32.30 × 8 =
  33. 33.40 × 4 =
  34. 34.69 × 4 =
  35. 35.73 × 4 =
  36. 36.63 × 4 =
  37. 37.47 × 4 =
  38. 38.36 × 4 =
  39. 39.44 × 4 =
  40. 40.57 × 4 =

Answer key

  1. 220
  2. 192
  3. 124
  4. 176
  5. 104
  6. 200
  7. 288
  8. 256
  9. 232
  10. 288
  11. 272
  12. 172
  13. 136
  14. 200
  15. 244
  16. 256
  17. 96
  18. 144
  19. 320
  20. 268
  21. 196
  22. 112
  23. 132
  24. 56
  25. 312
  26. 168
  27. 116
  28. 136
  29. 100
  30. 264
  31. 280
  32. 240
  33. 160
  34. 276
  35. 292
  36. 252
  37. 188
  38. 144
  39. 176
  40. 228

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