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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 961 · 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 44 =
  2. 2.Double 95 =
  3. 3.Half of 56 =
  4. 4.Half of 150 =
  5. 5.Double 74 =
  6. 6.Double 89 =
  7. 7.Half of 138 =
  8. 8.Double 16 =
  9. 9.Double 49 =
  10. 10.Double 17 =
  11. 11.Half of 28 =
  12. 12.Half of 40 =
  13. 13.Double 33 =
  14. 14.Half of 80 =
  15. 15.Double 91 =
  16. 16.Double 67 =
  17. 17.Half of 50 =
  18. 18.Double 63 =
  19. 19.Half of 170 =
  20. 20.Double 54 =
  21. 21.Double 37 =
  22. 22.Half of 46 =
  23. 23.Double 56 =
  24. 24.Double 76 =
  25. 25.Half of 120 =
  26. 26.Double 31 =
  27. 27.Half of 176 =
  28. 28.Double 57 =
  29. 29.Half of 128 =
  30. 30.Half of 94 =
  31. 31.Double 23 =
  32. 32.Double 68 =
  33. 33.Double 18 =
  34. 34.Double 81 =
  35. 35.Half of 68 =
  36. 36.Double 88 =
  37. 37.Double 85 =
  38. 38.Half of 152 =
  39. 39.Double 82 =
  40. 40.Half of 130 =

Answer key

  1. 22
  2. 190
  3. 28
  4. 75
  5. 148
  6. 178
  7. 69
  8. 32
  9. 98
  10. 34
  11. 14
  12. 20
  13. 66
  14. 40
  15. 182
  16. 134
  17. 25
  18. 126
  19. 85
  20. 108
  21. 74
  22. 23
  23. 112
  24. 152
  25. 60
  26. 62
  27. 88
  28. 114
  29. 64
  30. 47
  31. 46
  32. 136
  33. 36
  34. 162
  35. 34
  36. 176
  37. 170
  38. 76
  39. 164
  40. 65

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