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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 864 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Double 31 =
  2. 2.Double 67 =
  3. 3.Half of 66 =
  4. 4.Half of 180 =
  5. 5.Double 24 =
  6. 6.Double 89 =
  7. 7.Double 25 =
  8. 8.Double 21 =
  9. 9.Double 36 =
  10. 10.Double 94 =
  11. 11.Half of 130 =
  12. 12.Half of 162 =
  13. 13.Half of 120 =
  14. 14.Double 41 =
  15. 15.Double 29 =
  16. 16.Half of 58 =
  17. 17.Double 77 =
  18. 18.Double 62 =
  19. 19.Double 61 =
  20. 20.Double 85 =
  21. 21.Half of 184 =
  22. 22.Half of 48 =
  23. 23.Half of 128 =
  24. 24.Double 91 =
  25. 25.Half of 28 =
  26. 26.Double 88 =
  27. 27.Double 73 =
  28. 28.Half of 50 =
  29. 29.Half of 26 =
  30. 30.Double 33 =
  31. 31.Double 64 =
  32. 32.Half of 64 =
  33. 33.Half of 40 =
  34. 34.Double 92 =
  35. 35.Double 59 =
  36. 36.Double 34 =
  37. 37.Half of 88 =
  38. 38.Half of 152 =
  39. 39.Double 46 =
  40. 40.Half of 104 =

Answer key

  1. 62
  2. 134
  3. 33
  4. 90
  5. 48
  6. 178
  7. 50
  8. 42
  9. 72
  10. 188
  11. 65
  12. 81
  13. 60
  14. 82
  15. 58
  16. 29
  17. 154
  18. 124
  19. 122
  20. 170
  21. 92
  22. 24
  23. 64
  24. 182
  25. 14
  26. 176
  27. 146
  28. 25
  29. 13
  30. 66
  31. 128
  32. 32
  33. 20
  34. 184
  35. 118
  36. 68
  37. 44
  38. 76
  39. 92
  40. 52

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