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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 303 · 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 25 =
  2. 2.Half of 40 =
  3. 3.Double 27 =
  4. 4.Half of 96 =
  5. 5.Double 57 =
  6. 6.Double 78 =
  7. 7.Half of 120 =
  8. 8.Half of 100 =
  9. 9.Double 83 =
  10. 10.Double 55 =
  11. 11.Half of 138 =
  12. 12.Half of 90 =
  13. 13.Half of 154 =
  14. 14.Double 18 =
  15. 15.Half of 176 =
  16. 16.Half of 148 =
  17. 17.Half of 168 =
  18. 18.Double 84 =
  19. 19.Half of 182 =
  20. 20.Half of 58 =
  21. 21.Half of 46 =
  22. 22.Double 53 =
  23. 23.Half of 156 =
  24. 24.Double 33 =
  25. 25.Half of 146 =
  26. 26.Double 24 =
  27. 27.Half of 52 =
  28. 28.Double 47 =
  29. 29.Double 43 =
  30. 30.Half of 136 =
  31. 31.Double 26 =
  32. 32.Double 99 =
  33. 33.Double 89 =
  34. 34.Half of 164 =
  35. 35.Double 44 =
  36. 36.Half of 126 =
  37. 37.Double 91 =
  38. 38.Double 51 =
  39. 39.Double 45 =
  40. 40.Double 61 =

Answer key

  1. 50
  2. 20
  3. 54
  4. 48
  5. 114
  6. 156
  7. 60
  8. 50
  9. 166
  10. 110
  11. 69
  12. 45
  13. 77
  14. 36
  15. 88
  16. 74
  17. 84
  18. 168
  19. 91
  20. 29
  21. 23
  22. 106
  23. 78
  24. 66
  25. 73
  26. 48
  27. 26
  28. 94
  29. 86
  30. 68
  31. 52
  32. 198
  33. 178
  34. 82
  35. 88
  36. 63
  37. 182
  38. 102
  39. 90
  40. 122

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