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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 932 · 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 130 =
  2. 2.Double 59 =
  3. 3.Double 58 =
  4. 4.Half of 152 =
  5. 5.Double 17 =
  6. 6.Double 51 =
  7. 7.Double 31 =
  8. 8.Half of 56 =
  9. 9.Double 86 =
  10. 10.Half of 44 =
  11. 11.Double 85 =
  12. 12.Half of 54 =
  13. 13.Double 74 =
  14. 14.Double 61 =
  15. 15.Double 26 =
  16. 16.Half of 68 =
  17. 17.Half of 166 =
  18. 18.Double 62 =
  19. 19.Half of 58 =
  20. 20.Half of 36 =
  21. 21.Half of 30 =
  22. 22.Double 91 =
  23. 23.Double 25 =
  24. 24.Half of 128 =
  25. 25.Half of 148 =
  26. 26.Double 53 =
  27. 27.Half of 196 =
  28. 28.Half of 178 =
  29. 29.Double 96 =
  30. 30.Half of 62 =
  31. 31.Double 22 =
  32. 32.Double 95 =
  33. 33.Half of 120 =
  34. 34.Double 36 =
  35. 35.Double 29 =
  36. 36.Half of 104 =
  37. 37.Double 78 =
  38. 38.Half of 188 =
  39. 39.Half of 150 =
  40. 40.Double 84 =

Answer key

  1. 65
  2. 118
  3. 116
  4. 76
  5. 34
  6. 102
  7. 62
  8. 28
  9. 172
  10. 22
  11. 170
  12. 27
  13. 148
  14. 122
  15. 52
  16. 34
  17. 83
  18. 124
  19. 29
  20. 18
  21. 15
  22. 182
  23. 50
  24. 64
  25. 74
  26. 106
  27. 98
  28. 89
  29. 192
  30. 31
  31. 44
  32. 190
  33. 60
  34. 72
  35. 58
  36. 52
  37. 156
  38. 94
  39. 75
  40. 168

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