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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 984 · 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 176 =
  2. 2.Double 95 =
  3. 3.Half of 178 =
  4. 4.Double 34 =
  5. 5.Half of 138 =
  6. 6.Half of 100 =
  7. 7.Half of 132 =
  8. 8.Double 71 =
  9. 9.Half of 162 =
  10. 10.Double 91 =
  11. 11.Double 76 =
  12. 12.Half of 62 =
  13. 13.Half of 34 =
  14. 14.Double 84 =
  15. 15.Half of 98 =
  16. 16.Double 96 =
  17. 17.Double 61 =
  18. 18.Half of 94 =
  19. 19.Half of 148 =
  20. 20.Double 58 =
  21. 21.Double 38 =
  22. 22.Half of 28 =
  23. 23.Double 57 =
  24. 24.Half of 44 =
  25. 25.Half of 164 =
  26. 26.Double 25 =
  27. 27.Double 41 =
  28. 28.Double 79 =
  29. 29.Double 52 =
  30. 30.Double 88 =
  31. 31.Double 67 =
  32. 32.Half of 86 =
  33. 33.Half of 140 =
  34. 34.Half of 88 =
  35. 35.Half of 38 =
  36. 36.Half of 64 =
  37. 37.Double 81 =
  38. 38.Half of 46 =
  39. 39.Half of 160 =
  40. 40.Double 35 =

Answer key

  1. 88
  2. 190
  3. 89
  4. 68
  5. 69
  6. 50
  7. 66
  8. 142
  9. 81
  10. 182
  11. 152
  12. 31
  13. 17
  14. 168
  15. 49
  16. 192
  17. 122
  18. 47
  19. 74
  20. 116
  21. 76
  22. 14
  23. 114
  24. 22
  25. 82
  26. 50
  27. 82
  28. 158
  29. 104
  30. 176
  31. 134
  32. 43
  33. 70
  34. 44
  35. 19
  36. 32
  37. 162
  38. 23
  39. 80
  40. 70

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