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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 611 · 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 46 =
  2. 2.Double 37 =
  3. 3.Half of 94 =
  4. 4.Double 83 =
  5. 5.Double 78 =
  6. 6.Half of 128 =
  7. 7.Double 16 =
  8. 8.Half of 118 =
  9. 9.Double 67 =
  10. 10.Double 17 =
  11. 11.Double 33 =
  12. 12.Half of 104 =
  13. 13.Double 98 =
  14. 14.Half of 80 =
  15. 15.Half of 106 =
  16. 16.Double 21 =
  17. 17.Double 35 =
  18. 18.Half of 164 =
  19. 19.Double 65 =
  20. 20.Half of 192 =
  21. 21.Half of 138 =
  22. 22.Half of 190 =
  23. 23.Double 85 =
  24. 24.Double 52 =
  25. 25.Half of 150 =
  26. 26.Double 74 =
  27. 27.Double 82 =
  28. 28.Double 91 =
  29. 29.Half of 46 =
  30. 30.Half of 158 =
  31. 31.Half of 140 =
  32. 32.Double 97 =
  33. 33.Half of 174 =
  34. 34.Half of 28 =
  35. 35.Half of 170 =
  36. 36.Double 77 =
  37. 37.Half of 126 =
  38. 38.Double 68 =
  39. 39.Double 75 =
  40. 40.Double 87 =

Answer key

  1. 92
  2. 74
  3. 47
  4. 166
  5. 156
  6. 64
  7. 32
  8. 59
  9. 134
  10. 34
  11. 66
  12. 52
  13. 196
  14. 40
  15. 53
  16. 42
  17. 70
  18. 82
  19. 130
  20. 96
  21. 69
  22. 95
  23. 170
  24. 104
  25. 75
  26. 148
  27. 164
  28. 182
  29. 23
  30. 79
  31. 70
  32. 194
  33. 87
  34. 14
  35. 85
  36. 154
  37. 63
  38. 136
  39. 150
  40. 174

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