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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 277 · 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 68 =
  2. 2.Half of 38 =
  3. 3.Double 64 =
  4. 4.Half of 192 =
  5. 5.Half of 166 =
  6. 6.Half of 152 =
  7. 7.Half of 156 =
  8. 8.Double 61 =
  9. 9.Half of 40 =
  10. 10.Half of 194 =
  11. 11.Half of 182 =
  12. 12.Double 75 =
  13. 13.Double 92 =
  14. 14.Half of 28 =
  15. 15.Half of 158 =
  16. 16.Double 21 =
  17. 17.Double 88 =
  18. 18.Double 33 =
  19. 19.Double 65 =
  20. 20.Double 73 =
  21. 21.Double 91 =
  22. 22.Double 87 =
  23. 23.Half of 52 =
  24. 24.Half of 92 =
  25. 25.Half of 130 =
  26. 26.Double 31 =
  27. 27.Double 42 =
  28. 28.Half of 34 =
  29. 29.Half of 66 =
  30. 30.Double 57 =
  31. 31.Double 74 =
  32. 32.Half of 176 =
  33. 33.Double 62 =
  34. 34.Double 26 =
  35. 35.Double 58 =
  36. 36.Half of 164 =
  37. 37.Half of 134 =
  38. 38.Half of 118 =
  39. 39.Half of 48 =
  40. 40.Double 97 =

Answer key

  1. 136
  2. 19
  3. 128
  4. 96
  5. 83
  6. 76
  7. 78
  8. 122
  9. 20
  10. 97
  11. 91
  12. 150
  13. 184
  14. 14
  15. 79
  16. 42
  17. 176
  18. 66
  19. 130
  20. 146
  21. 182
  22. 174
  23. 26
  24. 46
  25. 65
  26. 62
  27. 84
  28. 17
  29. 33
  30. 114
  31. 148
  32. 88
  33. 124
  34. 52
  35. 116
  36. 82
  37. 67
  38. 59
  39. 24
  40. 194

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