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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 140 · 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 99 =
  2. 2.Half of 116 =
  3. 3.Half of 136 =
  4. 4.Half of 174 =
  5. 5.Half of 88 =
  6. 6.Half of 180 =
  7. 7.Half of 32 =
  8. 8.Half of 62 =
  9. 9.Double 35 =
  10. 10.Double 67 =
  11. 11.Double 85 =
  12. 12.Double 87 =
  13. 13.Half of 148 =
  14. 14.Double 48 =
  15. 15.Double 21 =
  16. 16.Half of 36 =
  17. 17.Double 61 =
  18. 18.Double 91 =
  19. 19.Double 89 =
  20. 20.Double 73 =
  21. 21.Half of 176 =
  22. 22.Half of 94 =
  23. 23.Double 27 =
  24. 24.Half of 98 =
  25. 25.Half of 56 =
  26. 26.Half of 60 =
  27. 27.Half of 164 =
  28. 28.Half of 30 =
  29. 29.Double 31 =
  30. 30.Half of 28 =
  31. 31.Half of 44 =
  32. 32.Double 78 =
  33. 33.Double 88 =
  34. 34.Half of 158 =
  35. 35.Double 36 =
  36. 36.Half of 26 =
  37. 37.Half of 186 =
  38. 38.Half of 58 =
  39. 39.Half of 162 =
  40. 40.Half of 92 =

Answer key

  1. 198
  2. 58
  3. 68
  4. 87
  5. 44
  6. 90
  7. 16
  8. 31
  9. 70
  10. 134
  11. 170
  12. 174
  13. 74
  14. 96
  15. 42
  16. 18
  17. 122
  18. 182
  19. 178
  20. 146
  21. 88
  22. 47
  23. 54
  24. 49
  25. 28
  26. 30
  27. 82
  28. 15
  29. 62
  30. 14
  31. 22
  32. 156
  33. 176
  34. 79
  35. 72
  36. 13
  37. 93
  38. 29
  39. 81
  40. 46

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