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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 729 · 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 63 =
  2. 2.Double 77 =
  3. 3.Double 67 =
  4. 4.Double 73 =
  5. 5.Double 86 =
  6. 6.Half of 28 =
  7. 7.Half of 192 =
  8. 8.Double 42 =
  9. 9.Double 53 =
  10. 10.Double 56 =
  11. 11.Double 61 =
  12. 12.Half of 52 =
  13. 13.Double 58 =
  14. 14.Double 28 =
  15. 15.Half of 56 =
  16. 16.Double 32 =
  17. 17.Half of 90 =
  18. 18.Half of 54 =
  19. 19.Half of 68 =
  20. 20.Double 64 =
  21. 21.Half of 62 =
  22. 22.Double 47 =
  23. 23.Half of 78 =
  24. 24.Half of 38 =
  25. 25.Double 51 =
  26. 26.Double 41 =
  27. 27.Double 75 =
  28. 28.Double 44 =
  29. 29.Half of 88 =
  30. 30.Double 16 =
  31. 31.Double 49 =
  32. 32.Double 79 =
  33. 33.Double 66 =
  34. 34.Double 89 =
  35. 35.Double 31 =
  36. 36.Half of 180 =
  37. 37.Double 98 =
  38. 38.Half of 60 =
  39. 39.Half of 118 =
  40. 40.Double 84 =

Answer key

  1. 126
  2. 154
  3. 134
  4. 146
  5. 172
  6. 14
  7. 96
  8. 84
  9. 106
  10. 112
  11. 122
  12. 26
  13. 116
  14. 56
  15. 28
  16. 64
  17. 45
  18. 27
  19. 34
  20. 128
  21. 31
  22. 94
  23. 39
  24. 19
  25. 102
  26. 82
  27. 150
  28. 88
  29. 44
  30. 32
  31. 98
  32. 158
  33. 132
  34. 178
  35. 62
  36. 90
  37. 196
  38. 30
  39. 59
  40. 168

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