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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 119 · 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 138 =
  2. 2.Double 47 =
  3. 3.Half of 48 =
  4. 4.Double 52 =
  5. 5.Half of 44 =
  6. 6.Half of 102 =
  7. 7.Double 21 =
  8. 8.Double 64 =
  9. 9.Double 63 =
  10. 10.Double 53 =
  11. 11.Double 29 =
  12. 12.Half of 40 =
  13. 13.Half of 50 =
  14. 14.Half of 56 =
  15. 15.Half of 192 =
  16. 16.Double 73 =
  17. 17.Half of 98 =
  18. 18.Double 32 =
  19. 19.Double 66 =
  20. 20.Half of 190 =
  21. 21.Half of 28 =
  22. 22.Half of 188 =
  23. 23.Double 25 =
  24. 24.Double 86 =
  25. 25.Double 81 =
  26. 26.Double 36 =
  27. 27.Double 97 =
  28. 28.Double 22 =
  29. 29.Half of 88 =
  30. 30.Double 83 =
  31. 31.Half of 164 =
  32. 32.Double 51 =
  33. 33.Half of 26 =
  34. 34.Half of 32 =
  35. 35.Half of 168 =
  36. 36.Half of 30 =
  37. 37.Half of 62 =
  38. 38.Half of 68 =
  39. 39.Half of 136 =
  40. 40.Half of 144 =

Answer key

  1. 69
  2. 94
  3. 24
  4. 104
  5. 22
  6. 51
  7. 42
  8. 128
  9. 126
  10. 106
  11. 58
  12. 20
  13. 25
  14. 28
  15. 96
  16. 146
  17. 49
  18. 64
  19. 132
  20. 95
  21. 14
  22. 94
  23. 50
  24. 172
  25. 162
  26. 72
  27. 194
  28. 44
  29. 44
  30. 166
  31. 82
  32. 102
  33. 13
  34. 16
  35. 84
  36. 15
  37. 31
  38. 34
  39. 68
  40. 72

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