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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 274 · 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. 1.34 × 8 =
  2. 2.15 × 8 =
  3. 3.40 × 4 =
  4. 4.39 × 8 =
  5. 5.28 × 8 =
  6. 6.25 × 4 =
  7. 7.64 × 4 =
  8. 8.68 × 4 =
  9. 9.12 × 8 =
  10. 10.16 × 4 =
  11. 11.48 × 4 =
  12. 12.35 × 8 =
  13. 13.38 × 4 =
  14. 14.75 × 4 =
  15. 15.13 × 8 =
  16. 16.59 × 4 =
  17. 17.15 × 4 =
  18. 18.16 × 8 =
  19. 19.67 × 4 =
  20. 20.31 × 8 =
  21. 21.29 × 4 =
  22. 22.20 × 8 =
  23. 23.24 × 8 =
  24. 24.50 × 4 =
  25. 25.44 × 4 =
  26. 26.18 × 8 =
  27. 27.45 × 4 =
  28. 28.28 × 4 =
  29. 29.21 × 4 =
  30. 30.43 × 4 =
  31. 31.52 × 4 =
  32. 32.14 × 8 =
  33. 33.25 × 8 =
  34. 34.21 × 8 =
  35. 35.53 × 4 =
  36. 36.62 × 4 =
  37. 37.31 × 4 =
  38. 38.39 × 4 =
  39. 39.40 × 8 =
  40. 40.22 × 4 =

Answer key

  1. 272
  2. 120
  3. 160
  4. 312
  5. 224
  6. 100
  7. 256
  8. 272
  9. 96
  10. 64
  11. 192
  12. 280
  13. 152
  14. 300
  15. 104
  16. 236
  17. 60
  18. 128
  19. 268
  20. 248
  21. 116
  22. 160
  23. 192
  24. 200
  25. 176
  26. 144
  27. 180
  28. 112
  29. 84
  30. 172
  31. 208
  32. 112
  33. 200
  34. 168
  35. 212
  36. 248
  37. 124
  38. 156
  39. 320
  40. 88

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