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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 360 · 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. 1.30 × 4 =
  2. 2.15 × 8 =
  3. 3.20 × 8 =
  4. 4.23 × 8 =
  5. 5.27 × 4 =
  6. 6.41 × 4 =
  7. 7.16 × 8 =
  8. 8.14 × 8 =
  9. 9.27 × 8 =
  10. 10.36 × 4 =
  11. 11.58 × 4 =
  12. 12.45 × 4 =
  13. 13.22 × 8 =
  14. 14.25 × 4 =
  15. 15.24 × 4 =
  16. 16.15 × 4 =
  17. 17.56 × 4 =
  18. 18.49 × 4 =
  19. 19.68 × 4 =
  20. 20.17 × 8 =
  21. 21.38 × 4 =
  22. 22.32 × 8 =
  23. 23.60 × 4 =
  24. 24.74 × 4 =
  25. 25.34 × 4 =
  26. 26.43 × 4 =
  27. 27.36 × 8 =
  28. 28.37 × 8 =
  29. 29.42 × 4 =
  30. 30.54 × 4 =
  31. 31.61 × 4 =
  32. 32.22 × 4 =
  33. 33.59 × 4 =
  34. 34.35 × 8 =
  35. 35.12 × 8 =
  36. 36.26 × 8 =
  37. 37.37 × 4 =
  38. 38.75 × 4 =
  39. 39.50 × 4 =
  40. 40.51 × 4 =

Answer key

  1. 120
  2. 120
  3. 160
  4. 184
  5. 108
  6. 164
  7. 128
  8. 112
  9. 216
  10. 144
  11. 232
  12. 180
  13. 176
  14. 100
  15. 96
  16. 60
  17. 224
  18. 196
  19. 272
  20. 136
  21. 152
  22. 256
  23. 240
  24. 296
  25. 136
  26. 172
  27. 288
  28. 296
  29. 168
  30. 216
  31. 244
  32. 88
  33. 236
  34. 280
  35. 96
  36. 208
  37. 148
  38. 300
  39. 200
  40. 204

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