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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 973 · 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 16 =
  2. 2.Double 82 =
  3. 3.Double 75 =
  4. 4.Half of 120 =
  5. 5.Half of 126 =
  6. 6.Double 76 =
  7. 7.Half of 96 =
  8. 8.Half of 54 =
  9. 9.Double 87 =
  10. 10.Half of 142 =
  11. 11.Half of 154 =
  12. 12.Double 66 =
  13. 13.Double 43 =
  14. 14.Half of 66 =
  15. 15.Half of 72 =
  16. 16.Half of 64 =
  17. 17.Half of 194 =
  18. 18.Double 29 =
  19. 19.Half of 134 =
  20. 20.Half of 198 =
  21. 21.Half of 118 =
  22. 22.Double 99 =
  23. 23.Double 32 =
  24. 24.Half of 98 =
  25. 25.Double 41 =
  26. 26.Double 18 =
  27. 27.Half of 136 =
  28. 28.Double 95 =
  29. 29.Half of 170 =
  30. 30.Half of 166 =
  31. 31.Half of 196 =
  32. 32.Half of 146 =
  33. 33.Double 31 =
  34. 34.Half of 26 =
  35. 35.Double 62 =
  36. 36.Half of 56 =
  37. 37.Double 34 =
  38. 38.Half of 130 =
  39. 39.Double 67 =
  40. 40.Double 84 =

Answer key

  1. 32
  2. 164
  3. 150
  4. 60
  5. 63
  6. 152
  7. 48
  8. 27
  9. 174
  10. 71
  11. 77
  12. 132
  13. 86
  14. 33
  15. 36
  16. 32
  17. 97
  18. 58
  19. 67
  20. 99
  21. 59
  22. 198
  23. 64
  24. 49
  25. 82
  26. 36
  27. 68
  28. 190
  29. 85
  30. 83
  31. 98
  32. 73
  33. 62
  34. 13
  35. 124
  36. 28
  37. 68
  38. 65
  39. 134
  40. 168

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