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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 892 · 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 134 =
  2. 2.Half of 156 =
  3. 3.Half of 132 =
  4. 4.Half of 190 =
  5. 5.Half of 66 =
  6. 6.Double 87 =
  7. 7.Double 56 =
  8. 8.Double 37 =
  9. 9.Double 82 =
  10. 10.Half of 108 =
  11. 11.Half of 142 =
  12. 12.Double 33 =
  13. 13.Half of 164 =
  14. 14.Half of 74 =
  15. 15.Half of 46 =
  16. 16.Double 47 =
  17. 17.Double 36 =
  18. 18.Half of 96 =
  19. 19.Double 76 =
  20. 20.Double 64 =
  21. 21.Double 94 =
  22. 22.Double 52 =
  23. 23.Half of 106 =
  24. 24.Double 27 =
  25. 25.Double 91 =
  26. 26.Half of 144 =
  27. 27.Half of 44 =
  28. 28.Half of 176 =
  29. 29.Half of 30 =
  30. 30.Half of 52 =
  31. 31.Double 31 =
  32. 32.Half of 162 =
  33. 33.Double 68 =
  34. 34.Half of 148 =
  35. 35.Half of 116 =
  36. 36.Double 25 =
  37. 37.Half of 92 =
  38. 38.Double 92 =
  39. 39.Double 21 =
  40. 40.Half of 84 =

Answer key

  1. 67
  2. 78
  3. 66
  4. 95
  5. 33
  6. 174
  7. 112
  8. 74
  9. 164
  10. 54
  11. 71
  12. 66
  13. 82
  14. 37
  15. 23
  16. 94
  17. 72
  18. 48
  19. 152
  20. 128
  21. 188
  22. 104
  23. 53
  24. 54
  25. 182
  26. 72
  27. 22
  28. 88
  29. 15
  30. 26
  31. 62
  32. 81
  33. 136
  34. 74
  35. 58
  36. 50
  37. 46
  38. 184
  39. 42
  40. 42

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