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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 856 · 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 87 =
  2. 2.Half of 58 =
  3. 3.Double 27 =
  4. 4.Double 18 =
  5. 5.Half of 66 =
  6. 6.Double 42 =
  7. 7.Half of 52 =
  8. 8.Double 45 =
  9. 9.Half of 132 =
  10. 10.Half of 50 =
  11. 11.Double 97 =
  12. 12.Double 31 =
  13. 13.Half of 136 =
  14. 14.Half of 188 =
  15. 15.Half of 34 =
  16. 16.Half of 134 =
  17. 17.Double 69 =
  18. 18.Double 21 =
  19. 19.Half of 30 =
  20. 20.Double 41 =
  21. 21.Half of 194 =
  22. 22.Half of 56 =
  23. 23.Half of 180 =
  24. 24.Double 76 =
  25. 25.Double 28 =
  26. 26.Double 46 =
  27. 27.Half of 98 =
  28. 28.Double 98 =
  29. 29.Half of 130 =
  30. 30.Double 57 =
  31. 31.Double 43 =
  32. 32.Half of 120 =
  33. 33.Double 83 =
  34. 34.Half of 84 =
  35. 35.Double 78 =
  36. 36.Half of 118 =
  37. 37.Double 25 =
  38. 38.Double 33 =
  39. 39.Double 92 =
  40. 40.Half of 108 =

Answer key

  1. 174
  2. 29
  3. 54
  4. 36
  5. 33
  6. 84
  7. 26
  8. 90
  9. 66
  10. 25
  11. 194
  12. 62
  13. 68
  14. 94
  15. 17
  16. 67
  17. 138
  18. 42
  19. 15
  20. 82
  21. 97
  22. 28
  23. 90
  24. 152
  25. 56
  26. 92
  27. 49
  28. 196
  29. 65
  30. 114
  31. 86
  32. 60
  33. 166
  34. 42
  35. 156
  36. 59
  37. 50
  38. 66
  39. 184
  40. 54

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