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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 407 · 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 19 =
  2. 2.Double 97 =
  3. 3.Double 28 =
  4. 4.Double 52 =
  5. 5.Double 81 =
  6. 6.Half of 48 =
  7. 7.Double 84 =
  8. 8.Half of 156 =
  9. 9.Double 18 =
  10. 10.Half of 176 =
  11. 11.Half of 180 =
  12. 12.Double 91 =
  13. 13.Half of 88 =
  14. 14.Double 36 =
  15. 15.Double 26 =
  16. 16.Half of 142 =
  17. 17.Double 83 =
  18. 18.Half of 26 =
  19. 19.Double 44 =
  20. 20.Double 74 =
  21. 21.Half of 128 =
  22. 22.Half of 44 =
  23. 23.Double 59 =
  24. 24.Half of 108 =
  25. 25.Half of 134 =
  26. 26.Half of 68 =
  27. 27.Double 31 =
  28. 28.Double 35 =
  29. 29.Half of 78 =
  30. 30.Double 22 =
  31. 31.Half of 106 =
  32. 32.Double 41 =
  33. 33.Double 24 =
  34. 34.Half of 120 =
  35. 35.Half of 36 =
  36. 36.Half of 192 =
  37. 37.Double 33 =
  38. 38.Double 58 =
  39. 39.Half of 138 =
  40. 40.Double 25 =

Answer key

  1. 38
  2. 194
  3. 56
  4. 104
  5. 162
  6. 24
  7. 168
  8. 78
  9. 36
  10. 88
  11. 90
  12. 182
  13. 44
  14. 72
  15. 52
  16. 71
  17. 166
  18. 13
  19. 88
  20. 148
  21. 64
  22. 22
  23. 118
  24. 54
  25. 67
  26. 34
  27. 62
  28. 70
  29. 39
  30. 44
  31. 53
  32. 82
  33. 48
  34. 60
  35. 18
  36. 96
  37. 66
  38. 116
  39. 69
  40. 50

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