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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 919 · 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 88 =
  2. 2.Double 76 =
  3. 3.Half of 136 =
  4. 4.Half of 180 =
  5. 5.Double 72 =
  6. 6.Double 96 =
  7. 7.Half of 60 =
  8. 8.Double 31 =
  9. 9.Double 87 =
  10. 10.Double 47 =
  11. 11.Half of 42 =
  12. 12.Double 71 =
  13. 13.Double 51 =
  14. 14.Half of 90 =
  15. 15.Half of 146 =
  16. 16.Double 83 =
  17. 17.Double 29 =
  18. 18.Half of 92 =
  19. 19.Half of 68 =
  20. 20.Double 37 =
  21. 21.Double 54 =
  22. 22.Half of 30 =
  23. 23.Half of 176 =
  24. 24.Double 86 =
  25. 25.Half of 66 =
  26. 26.Double 56 =
  27. 27.Double 58 =
  28. 28.Half of 190 =
  29. 29.Double 49 =
  30. 30.Half of 164 =
  31. 31.Double 28 =
  32. 32.Half of 70 =
  33. 33.Double 78 =
  34. 34.Half of 54 =
  35. 35.Double 99 =
  36. 36.Half of 158 =
  37. 37.Half of 114 =
  38. 38.Double 21 =
  39. 39.Half of 84 =
  40. 40.Half of 110 =

Answer key

  1. 176
  2. 152
  3. 68
  4. 90
  5. 144
  6. 192
  7. 30
  8. 62
  9. 174
  10. 94
  11. 21
  12. 142
  13. 102
  14. 45
  15. 73
  16. 166
  17. 58
  18. 46
  19. 34
  20. 74
  21. 108
  22. 15
  23. 88
  24. 172
  25. 33
  26. 112
  27. 116
  28. 95
  29. 98
  30. 82
  31. 56
  32. 35
  33. 156
  34. 27
  35. 198
  36. 79
  37. 57
  38. 42
  39. 42
  40. 55

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