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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 948 · 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 54 =
  2. 2.Double 22 =
  3. 3.Half of 152 =
  4. 4.Double 39 =
  5. 5.Double 78 =
  6. 6.Double 38 =
  7. 7.Half of 150 =
  8. 8.Double 52 =
  9. 9.Double 92 =
  10. 10.Double 37 =
  11. 11.Double 19 =
  12. 12.Half of 34 =
  13. 13.Half of 48 =
  14. 14.Half of 138 =
  15. 15.Double 71 =
  16. 16.Double 21 =
  17. 17.Half of 44 =
  18. 18.Double 58 =
  19. 19.Half of 38 =
  20. 20.Double 41 =
  21. 21.Half of 124 =
  22. 22.Double 75 =
  23. 23.Half of 102 =
  24. 24.Double 63 =
  25. 25.Half of 140 =
  26. 26.Half of 80 =
  27. 27.Double 61 =
  28. 28.Double 89 =
  29. 29.Half of 122 =
  30. 30.Half of 40 =
  31. 31.Half of 164 =
  32. 32.Half of 168 =
  33. 33.Double 96 =
  34. 34.Half of 172 =
  35. 35.Half of 116 =
  36. 36.Double 51 =
  37. 37.Half of 158 =
  38. 38.Double 27 =
  39. 39.Double 91 =
  40. 40.Double 73 =

Answer key

  1. 108
  2. 44
  3. 76
  4. 78
  5. 156
  6. 76
  7. 75
  8. 104
  9. 184
  10. 74
  11. 38
  12. 17
  13. 24
  14. 69
  15. 142
  16. 42
  17. 22
  18. 116
  19. 19
  20. 82
  21. 62
  22. 150
  23. 51
  24. 126
  25. 70
  26. 40
  27. 122
  28. 178
  29. 61
  30. 20
  31. 82
  32. 84
  33. 192
  34. 86
  35. 58
  36. 102
  37. 79
  38. 54
  39. 182
  40. 146

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