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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 568 · 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 76 =
  2. 2.Double 77 =
  3. 3.Double 82 =
  4. 4.Half of 138 =
  5. 5.Half of 116 =
  6. 6.Double 87 =
  7. 7.Double 66 =
  8. 8.Double 73 =
  9. 9.Double 79 =
  10. 10.Double 78 =
  11. 11.Half of 88 =
  12. 12.Half of 182 =
  13. 13.Half of 126 =
  14. 14.Half of 190 =
  15. 15.Half of 160 =
  16. 16.Double 41 =
  17. 17.Double 71 =
  18. 18.Double 22 =
  19. 19.Double 34 =
  20. 20.Double 76 =
  21. 21.Double 31 =
  22. 22.Half of 66 =
  23. 23.Half of 26 =
  24. 24.Half of 50 =
  25. 25.Half of 96 =
  26. 26.Double 48 =
  27. 27.Half of 148 =
  28. 28.Half of 90 =
  29. 29.Half of 58 =
  30. 30.Half of 196 =
  31. 31.Half of 188 =
  32. 32.Double 51 =
  33. 33.Half of 38 =
  34. 34.Double 91 =
  35. 35.Double 93 =
  36. 36.Half of 192 =
  37. 37.Half of 156 =
  38. 38.Double 64 =
  39. 39.Half of 124 =
  40. 40.Half of 106 =

Answer key

  1. 38
  2. 154
  3. 164
  4. 69
  5. 58
  6. 174
  7. 132
  8. 146
  9. 158
  10. 156
  11. 44
  12. 91
  13. 63
  14. 95
  15. 80
  16. 82
  17. 142
  18. 44
  19. 68
  20. 152
  21. 62
  22. 33
  23. 13
  24. 25
  25. 48
  26. 96
  27. 74
  28. 45
  29. 29
  30. 98
  31. 94
  32. 102
  33. 19
  34. 182
  35. 186
  36. 96
  37. 78
  38. 128
  39. 62
  40. 53

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