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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 946 · 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.Half of 142 =
  2. 2.Half of 90 =
  3. 3.Double 87 =
  4. 4.Half of 64 =
  5. 5.Double 37 =
  6. 6.Half of 106 =
  7. 7.Double 57 =
  8. 8.Half of 128 =
  9. 9.Half of 84 =
  10. 10.Double 48 =
  11. 11.Double 98 =
  12. 12.Double 51 =
  13. 13.Double 46 =
  14. 14.Double 41 =
  15. 15.Half of 178 =
  16. 16.Double 52 =
  17. 17.Double 61 =
  18. 18.Half of 168 =
  19. 19.Double 65 =
  20. 20.Half of 132 =
  21. 21.Half of 166 =
  22. 22.Half of 32 =
  23. 23.Half of 170 =
  24. 24.Half of 80 =
  25. 25.Half of 26 =
  26. 26.Half of 66 =
  27. 27.Double 85 =
  28. 28.Double 76 =
  29. 29.Half of 72 =
  30. 30.Double 92 =
  31. 31.Double 93 =
  32. 32.Half of 108 =
  33. 33.Double 42 =
  34. 34.Half of 150 =
  35. 35.Half of 62 =
  36. 36.Half of 54 =
  37. 37.Double 53 =
  38. 38.Half of 196 =
  39. 39.Double 21 =
  40. 40.Half of 124 =

Answer key

  1. 71
  2. 45
  3. 174
  4. 32
  5. 74
  6. 53
  7. 114
  8. 64
  9. 42
  10. 96
  11. 196
  12. 102
  13. 92
  14. 82
  15. 89
  16. 104
  17. 122
  18. 84
  19. 130
  20. 66
  21. 83
  22. 16
  23. 85
  24. 40
  25. 13
  26. 33
  27. 170
  28. 152
  29. 36
  30. 184
  31. 186
  32. 54
  33. 84
  34. 75
  35. 31
  36. 27
  37. 106
  38. 98
  39. 42
  40. 62

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