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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 71 · 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 57 =
  3. 3.Double 44 =
  4. 4.Double 71 =
  5. 5.Double 79 =
  6. 6.Half of 60 =
  7. 7.Half of 80 =
  8. 8.Double 31 =
  9. 9.Double 19 =
  10. 10.Half of 36 =
  11. 11.Half of 184 =
  12. 12.Half of 98 =
  13. 13.Double 47 =
  14. 14.Double 24 =
  15. 15.Double 17 =
  16. 16.Half of 76 =
  17. 17.Half of 100 =
  18. 18.Double 72 =
  19. 19.Double 45 =
  20. 20.Half of 120 =
  21. 21.Double 91 =
  22. 22.Half of 192 =
  23. 23.Half of 124 =
  24. 24.Half of 86 =
  25. 25.Double 94 =
  26. 26.Half of 170 =
  27. 27.Half of 176 =
  28. 28.Half of 88 =
  29. 29.Half of 44 =
  30. 30.Double 74 =
  31. 31.Double 52 =
  32. 32.Double 36 =
  33. 33.Half of 48 =
  34. 34.Double 68 =
  35. 35.Half of 164 =
  36. 36.Double 54 =
  37. 37.Half of 30 =
  38. 38.Half of 156 =
  39. 39.Double 61 =
  40. 40.Double 98 =

Answer key

  1. 69
  2. 114
  3. 88
  4. 142
  5. 158
  6. 30
  7. 40
  8. 62
  9. 38
  10. 18
  11. 92
  12. 49
  13. 94
  14. 48
  15. 34
  16. 38
  17. 50
  18. 144
  19. 90
  20. 60
  21. 182
  22. 96
  23. 62
  24. 43
  25. 188
  26. 85
  27. 88
  28. 44
  29. 22
  30. 148
  31. 104
  32. 72
  33. 24
  34. 136
  35. 82
  36. 108
  37. 15
  38. 78
  39. 122
  40. 196

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