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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 949 · 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 53 =
  2. 2.Half of 78 =
  3. 3.Half of 52 =
  4. 4.Double 65 =
  5. 5.Half of 72 =
  6. 6.Double 61 =
  7. 7.Double 46 =
  8. 8.Half of 104 =
  9. 9.Double 58 =
  10. 10.Double 74 =
  11. 11.Half of 156 =
  12. 12.Half of 88 =
  13. 13.Double 67 =
  14. 14.Half of 40 =
  15. 15.Half of 54 =
  16. 16.Double 84 =
  17. 17.Double 57 =
  18. 18.Half of 112 =
  19. 19.Half of 32 =
  20. 20.Half of 76 =
  21. 21.Half of 108 =
  22. 22.Double 98 =
  23. 23.Double 62 =
  24. 24.Half of 194 =
  25. 25.Half of 130 =
  26. 26.Double 21 =
  27. 27.Half of 138 =
  28. 28.Double 52 =
  29. 29.Double 31 =
  30. 30.Double 95 =
  31. 31.Half of 126 =
  32. 32.Half of 162 =
  33. 33.Half of 46 =
  34. 34.Half of 48 =
  35. 35.Double 19 =
  36. 36.Half of 192 =
  37. 37.Double 44 =
  38. 38.Half of 166 =
  39. 39.Half of 132 =
  40. 40.Double 96 =

Answer key

  1. 106
  2. 39
  3. 26
  4. 130
  5. 36
  6. 122
  7. 92
  8. 52
  9. 116
  10. 148
  11. 78
  12. 44
  13. 134
  14. 20
  15. 27
  16. 168
  17. 114
  18. 56
  19. 16
  20. 38
  21. 54
  22. 196
  23. 124
  24. 97
  25. 65
  26. 42
  27. 69
  28. 104
  29. 62
  30. 190
  31. 63
  32. 81
  33. 23
  34. 24
  35. 38
  36. 96
  37. 88
  38. 83
  39. 66
  40. 192

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