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Multiply by 4 and 8 Mental Maths Worksheet

Mental maths lesson 10: Multiply by 4 and 8 by doubling · Set 493 · 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. 1.40 × 4 =
  2. 2.21 × 8 =
  3. 3.19 × 8 =
  4. 4.13 × 8 =
  5. 5.25 × 8 =
  6. 6.16 × 8 =
  7. 7.17 × 8 =
  8. 8.37 × 4 =
  9. 9.36 × 8 =
  10. 10.41 × 4 =
  11. 11.38 × 8 =
  12. 12.39 × 8 =
  13. 13.55 × 4 =
  14. 14.14 × 4 =
  15. 15.12 × 4 =
  16. 16.57 × 4 =
  17. 17.22 × 4 =
  18. 18.64 × 4 =
  19. 19.19 × 4 =
  20. 20.48 × 4 =
  21. 21.34 × 8 =
  22. 22.12 × 8 =
  23. 23.36 × 4 =
  24. 24.40 × 8 =
  25. 25.28 × 8 =
  26. 26.43 × 4 =
  27. 27.32 × 8 =
  28. 28.31 × 8 =
  29. 29.15 × 8 =
  30. 30.44 × 4 =
  31. 31.20 × 8 =
  32. 32.31 × 4 =
  33. 33.34 × 4 =
  34. 34.29 × 8 =
  35. 35.45 × 4 =
  36. 36.30 × 8 =
  37. 37.74 × 4 =
  38. 38.38 × 4 =
  39. 39.35 × 4 =
  40. 40.27 × 8 =

Answer key

  1. 160
  2. 168
  3. 152
  4. 104
  5. 200
  6. 128
  7. 136
  8. 148
  9. 288
  10. 164
  11. 304
  12. 312
  13. 220
  14. 56
  15. 48
  16. 228
  17. 88
  18. 256
  19. 76
  20. 192
  21. 272
  22. 96
  23. 144
  24. 320
  25. 224
  26. 172
  27. 256
  28. 248
  29. 120
  30. 176
  31. 160
  32. 124
  33. 136
  34. 232
  35. 180
  36. 240
  37. 296
  38. 152
  39. 140
  40. 216

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