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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 959 · 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 51 =
  2. 2.Half of 82 =
  3. 3.Half of 86 =
  4. 4.Double 68 =
  5. 5.Half of 56 =
  6. 6.Half of 28 =
  7. 7.Half of 106 =
  8. 8.Double 33 =
  9. 9.Half of 70 =
  10. 10.Double 38 =
  11. 11.Double 63 =
  12. 12.Half of 72 =
  13. 13.Half of 88 =
  14. 14.Half of 164 =
  15. 15.Double 32 =
  16. 16.Half of 118 =
  17. 17.Half of 40 =
  18. 18.Double 35 =
  19. 19.Half of 124 =
  20. 20.Double 84 =
  21. 21.Half of 64 =
  22. 22.Half of 78 =
  23. 23.Half of 108 =
  24. 24.Double 24 =
  25. 25.Double 21 =
  26. 26.Half of 184 =
  27. 27.Half of 196 =
  28. 28.Half of 126 =
  29. 29.Half of 102 =
  30. 30.Half of 160 =
  31. 31.Double 61 =
  32. 32.Double 57 =
  33. 33.Double 18 =
  34. 34.Double 46 =
  35. 35.Half of 112 =
  36. 36.Double 83 =
  37. 37.Double 64 =
  38. 38.Double 91 =
  39. 39.Half of 110 =
  40. 40.Double 45 =

Answer key

  1. 102
  2. 41
  3. 43
  4. 136
  5. 28
  6. 14
  7. 53
  8. 66
  9. 35
  10. 76
  11. 126
  12. 36
  13. 44
  14. 82
  15. 64
  16. 59
  17. 20
  18. 70
  19. 62
  20. 168
  21. 32
  22. 39
  23. 54
  24. 48
  25. 42
  26. 92
  27. 98
  28. 63
  29. 51
  30. 80
  31. 122
  32. 114
  33. 36
  34. 92
  35. 56
  36. 166
  37. 128
  38. 182
  39. 55
  40. 90

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