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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 887 · 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 43 =
  2. 2.Double 22 =
  3. 3.Half of 66 =
  4. 4.Half of 90 =
  5. 5.Half of 104 =
  6. 6.Double 88 =
  7. 7.Double 21 =
  8. 8.Half of 152 =
  9. 9.Half of 114 =
  10. 10.Double 17 =
  11. 11.Half of 40 =
  12. 12.Double 51 =
  13. 13.Half of 76 =
  14. 14.Half of 46 =
  15. 15.Half of 130 =
  16. 16.Double 67 =
  17. 17.Double 52 =
  18. 18.Double 76 =
  19. 19.Double 81 =
  20. 20.Half of 136 =
  21. 21.Half of 36 =
  22. 22.Half of 186 =
  23. 23.Half of 164 =
  24. 24.Double 75 =
  25. 25.Double 65 =
  26. 26.Half of 74 =
  27. 27.Half of 196 =
  28. 28.Double 16 =
  29. 29.Double 66 =
  30. 30.Double 92 =
  31. 31.Double 72 =
  32. 32.Double 41 =
  33. 33.Half of 120 =
  34. 34.Double 26 =
  35. 35.Half of 168 =
  36. 36.Half of 148 =
  37. 37.Half of 60 =
  38. 38.Half of 72 =
  39. 39.Half of 160 =
  40. 40.Double 18 =

Answer key

  1. 86
  2. 44
  3. 33
  4. 45
  5. 52
  6. 176
  7. 42
  8. 76
  9. 57
  10. 34
  11. 20
  12. 102
  13. 38
  14. 23
  15. 65
  16. 134
  17. 104
  18. 152
  19. 162
  20. 68
  21. 18
  22. 93
  23. 82
  24. 150
  25. 130
  26. 37
  27. 98
  28. 32
  29. 132
  30. 184
  31. 144
  32. 82
  33. 60
  34. 52
  35. 84
  36. 74
  37. 30
  38. 36
  39. 80
  40. 36

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