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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 581 · 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 92 =
  2. 2.Half of 64 =
  3. 3.Double 73 =
  4. 4.Double 51 =
  5. 5.Double 81 =
  6. 6.Double 43 =
  7. 7.Half of 138 =
  8. 8.Double 63 =
  9. 9.Double 66 =
  10. 10.Half of 86 =
  11. 11.Half of 172 =
  12. 12.Double 19 =
  13. 13.Half of 46 =
  14. 14.Double 52 =
  15. 15.Double 94 =
  16. 16.Half of 42 =
  17. 17.Half of 174 =
  18. 18.Half of 150 =
  19. 19.Half of 72 =
  20. 20.Half of 100 =
  21. 21.Double 33 =
  22. 22.Double 46 =
  23. 23.Double 67 =
  24. 24.Double 42 =
  25. 25.Half of 140 =
  26. 26.Double 98 =
  27. 27.Double 28 =
  28. 28.Double 36 =
  29. 29.Double 82 =
  30. 30.Half of 160 =
  31. 31.Double 41 =
  32. 32.Double 79 =
  33. 33.Half of 30 =
  34. 34.Double 49 =
  35. 35.Double 55 =
  36. 36.Double 21 =
  37. 37.Half of 90 =
  38. 38.Double 64 =
  39. 39.Double 61 =
  40. 40.Double 69 =

Answer key

  1. 46
  2. 32
  3. 146
  4. 102
  5. 162
  6. 86
  7. 69
  8. 126
  9. 132
  10. 43
  11. 86
  12. 38
  13. 23
  14. 104
  15. 188
  16. 21
  17. 87
  18. 75
  19. 36
  20. 50
  21. 66
  22. 92
  23. 134
  24. 84
  25. 70
  26. 196
  27. 56
  28. 72
  29. 164
  30. 80
  31. 82
  32. 158
  33. 15
  34. 98
  35. 110
  36. 42
  37. 45
  38. 128
  39. 122
  40. 138

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