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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 850 · 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 55 =
  2. 2.Half of 154 =
  3. 3.Double 76 =
  4. 4.Half of 132 =
  5. 5.Half of 50 =
  6. 6.Double 51 =
  7. 7.Half of 150 =
  8. 8.Half of 34 =
  9. 9.Double 96 =
  10. 10.Double 75 =
  11. 11.Double 29 =
  12. 12.Half of 194 =
  13. 13.Double 61 =
  14. 14.Double 48 =
  15. 15.Double 84 =
  16. 16.Half of 134 =
  17. 17.Half of 84 =
  18. 18.Double 72 =
  19. 19.Double 18 =
  20. 20.Double 22 =
  21. 21.Half of 108 =
  22. 22.Half of 96 =
  23. 23.Double 91 =
  24. 24.Half of 26 =
  25. 25.Double 52 =
  26. 26.Half of 120 =
  27. 27.Half of 58 =
  28. 28.Half of 172 =
  29. 29.Double 34 =
  30. 30.Double 78 =
  31. 31.Double 66 =
  32. 32.Half of 102 =
  33. 33.Double 47 =
  34. 34.Half of 36 =
  35. 35.Double 42 =
  36. 36.Half of 144 =
  37. 37.Double 38 =
  38. 38.Double 99 =
  39. 39.Double 64 =
  40. 40.Half of 92 =

Answer key

  1. 110
  2. 77
  3. 152
  4. 66
  5. 25
  6. 102
  7. 75
  8. 17
  9. 192
  10. 150
  11. 58
  12. 97
  13. 122
  14. 96
  15. 168
  16. 67
  17. 42
  18. 144
  19. 36
  20. 44
  21. 54
  22. 48
  23. 182
  24. 13
  25. 104
  26. 60
  27. 29
  28. 86
  29. 68
  30. 156
  31. 132
  32. 51
  33. 94
  34. 18
  35. 84
  36. 72
  37. 76
  38. 198
  39. 128
  40. 46

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