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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 990 · 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 54 =
  2. 2.Double 35 =
  3. 3.Double 67 =
  4. 4.Half of 26 =
  5. 5.Double 34 =
  6. 6.Double 47 =
  7. 7.Half of 188 =
  8. 8.Double 45 =
  9. 9.Half of 146 =
  10. 10.Half of 60 =
  11. 11.Double 86 =
  12. 12.Double 71 =
  13. 13.Double 53 =
  14. 14.Double 51 =
  15. 15.Half of 106 =
  16. 16.Double 28 =
  17. 17.Double 31 =
  18. 18.Double 58 =
  19. 19.Double 19 =
  20. 20.Half of 154 =
  21. 21.Half of 74 =
  22. 22.Double 88 =
  23. 23.Double 39 =
  24. 24.Double 56 =
  25. 25.Double 29 =
  26. 26.Half of 86 =
  27. 27.Half of 36 =
  28. 28.Double 54 =
  29. 29.Double 48 =
  30. 30.Double 32 =
  31. 31.Half of 192 =
  32. 32.Double 99 =
  33. 33.Double 84 =
  34. 34.Double 75 =
  35. 35.Double 38 =
  36. 36.Half of 160 =
  37. 37.Double 62 =
  38. 38.Half of 176 =
  39. 39.Double 78 =
  40. 40.Half of 134 =

Answer key

  1. 27
  2. 70
  3. 134
  4. 13
  5. 68
  6. 94
  7. 94
  8. 90
  9. 73
  10. 30
  11. 172
  12. 142
  13. 106
  14. 102
  15. 53
  16. 56
  17. 62
  18. 116
  19. 38
  20. 77
  21. 37
  22. 176
  23. 78
  24. 112
  25. 58
  26. 43
  27. 18
  28. 108
  29. 96
  30. 64
  31. 96
  32. 198
  33. 168
  34. 150
  35. 76
  36. 80
  37. 124
  38. 88
  39. 156
  40. 67

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