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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 131 · 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 88 =
  2. 2.Double 91 =
  3. 3.Half of 138 =
  4. 4.Double 28 =
  5. 5.Half of 50 =
  6. 6.Half of 58 =
  7. 7.Double 96 =
  8. 8.Double 36 =
  9. 9.Double 47 =
  10. 10.Half of 70 =
  11. 11.Half of 162 =
  12. 12.Half of 120 =
  13. 13.Double 34 =
  14. 14.Double 39 =
  15. 15.Double 53 =
  16. 16.Half of 180 =
  17. 17.Double 79 =
  18. 18.Double 77 =
  19. 19.Half of 38 =
  20. 20.Half of 160 =
  21. 21.Half of 146 =
  22. 22.Double 24 =
  23. 23.Half of 88 =
  24. 24.Double 38 =
  25. 25.Double 72 =
  26. 26.Double 92 =
  27. 27.Double 56 =
  28. 28.Double 16 =
  29. 29.Double 35 =
  30. 30.Double 33 =
  31. 31.Half of 136 =
  32. 32.Double 49 =
  33. 33.Double 82 =
  34. 34.Half of 186 =
  35. 35.Double 17 =
  36. 36.Half of 102 =
  37. 37.Half of 156 =
  38. 38.Double 62 =
  39. 39.Half of 62 =
  40. 40.Double 98 =

Answer key

  1. 176
  2. 182
  3. 69
  4. 56
  5. 25
  6. 29
  7. 192
  8. 72
  9. 94
  10. 35
  11. 81
  12. 60
  13. 68
  14. 78
  15. 106
  16. 90
  17. 158
  18. 154
  19. 19
  20. 80
  21. 73
  22. 48
  23. 44
  24. 76
  25. 144
  26. 184
  27. 112
  28. 32
  29. 70
  30. 66
  31. 68
  32. 98
  33. 164
  34. 93
  35. 34
  36. 51
  37. 78
  38. 124
  39. 31
  40. 196

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