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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 858 · 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 126 =
  2. 2.Half of 64 =
  3. 3.Double 24 =
  4. 4.Double 31 =
  5. 5.Double 57 =
  6. 6.Half of 138 =
  7. 7.Double 34 =
  8. 8.Double 52 =
  9. 9.Half of 46 =
  10. 10.Double 58 =
  11. 11.Half of 38 =
  12. 12.Half of 134 =
  13. 13.Half of 164 =
  14. 14.Double 49 =
  15. 15.Half of 54 =
  16. 16.Half of 146 =
  17. 17.Double 38 =
  18. 18.Half of 102 =
  19. 19.Half of 56 =
  20. 20.Half of 58 =
  21. 21.Half of 186 =
  22. 22.Double 37 =
  23. 23.Double 32 =
  24. 24.Double 61 =
  25. 25.Half of 70 =
  26. 26.Half of 72 =
  27. 27.Half of 28 =
  28. 28.Double 79 =
  29. 29.Double 98 =
  30. 30.Half of 80 =
  31. 31.Double 42 =
  32. 32.Double 62 =
  33. 33.Half of 166 =
  34. 34.Double 35 =
  35. 35.Half of 176 =
  36. 36.Double 99 =
  37. 37.Half of 78 =
  38. 38.Double 59 =
  39. 39.Double 23 =
  40. 40.Double 51 =

Answer key

  1. 63
  2. 32
  3. 48
  4. 62
  5. 114
  6. 69
  7. 68
  8. 104
  9. 23
  10. 116
  11. 19
  12. 67
  13. 82
  14. 98
  15. 27
  16. 73
  17. 76
  18. 51
  19. 28
  20. 29
  21. 93
  22. 74
  23. 64
  24. 122
  25. 35
  26. 36
  27. 14
  28. 158
  29. 196
  30. 40
  31. 84
  32. 124
  33. 83
  34. 70
  35. 88
  36. 198
  37. 39
  38. 118
  39. 46
  40. 102

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