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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 77 · 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.Double 93 =
  3. 3.Half of 102 =
  4. 4.Half of 104 =
  5. 5.Double 21 =
  6. 6.Double 65 =
  7. 7.Double 18 =
  8. 8.Half of 38 =
  9. 9.Half of 136 =
  10. 10.Half of 192 =
  11. 11.Double 71 =
  12. 12.Double 78 =
  13. 13.Double 92 =
  14. 14.Double 99 =
  15. 15.Half of 176 =
  16. 16.Half of 106 =
  17. 17.Double 76 =
  18. 18.Half of 30 =
  19. 19.Half of 188 =
  20. 20.Double 46 =
  21. 21.Double 57 =
  22. 22.Double 64 =
  23. 23.Double 23 =
  24. 24.Double 85 =
  25. 25.Half of 60 =
  26. 26.Double 24 =
  27. 27.Double 31 =
  28. 28.Half of 108 =
  29. 29.Double 48 =
  30. 30.Half of 48 =
  31. 31.Half of 156 =
  32. 32.Half of 56 =
  33. 33.Double 87 =
  34. 34.Half of 180 =
  35. 35.Double 73 =
  36. 36.Half of 86 =
  37. 37.Half of 84 =
  38. 38.Half of 148 =
  39. 39.Half of 142 =
  40. 40.Half of 162 =

Answer key

  1. 50
  2. 186
  3. 51
  4. 52
  5. 42
  6. 130
  7. 36
  8. 19
  9. 68
  10. 96
  11. 142
  12. 156
  13. 184
  14. 198
  15. 88
  16. 53
  17. 152
  18. 15
  19. 94
  20. 92
  21. 114
  22. 128
  23. 46
  24. 170
  25. 30
  26. 48
  27. 62
  28. 54
  29. 96
  30. 24
  31. 78
  32. 28
  33. 174
  34. 90
  35. 146
  36. 43
  37. 42
  38. 74
  39. 71
  40. 81

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