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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 409 · 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 108 =
  2. 2.Double 81 =
  3. 3.Double 36 =
  4. 4.Double 26 =
  5. 5.Half of 66 =
  6. 6.Double 63 =
  7. 7.Double 44 =
  8. 8.Double 73 =
  9. 9.Double 23 =
  10. 10.Double 91 =
  11. 11.Double 25 =
  12. 12.Half of 58 =
  13. 13.Double 59 =
  14. 14.Half of 188 =
  15. 15.Double 21 =
  16. 16.Double 65 =
  17. 17.Half of 94 =
  18. 18.Double 53 =
  19. 19.Half of 154 =
  20. 20.Half of 160 =
  21. 21.Half of 112 =
  22. 22.Half of 180 =
  23. 23.Half of 118 =
  24. 24.Double 67 =
  25. 25.Half of 104 =
  26. 26.Double 41 =
  27. 27.Double 16 =
  28. 28.Half of 152 =
  29. 29.Double 32 =
  30. 30.Half of 62 =
  31. 31.Double 31 =
  32. 32.Half of 142 =
  33. 33.Half of 80 =
  34. 34.Double 55 =
  35. 35.Half of 30 =
  36. 36.Half of 190 =
  37. 37.Half of 34 =
  38. 38.Double 72 =
  39. 39.Half of 40 =
  40. 40.Double 61 =

Answer key

  1. 54
  2. 162
  3. 72
  4. 52
  5. 33
  6. 126
  7. 88
  8. 146
  9. 46
  10. 182
  11. 50
  12. 29
  13. 118
  14. 94
  15. 42
  16. 130
  17. 47
  18. 106
  19. 77
  20. 80
  21. 56
  22. 90
  23. 59
  24. 134
  25. 52
  26. 82
  27. 32
  28. 76
  29. 64
  30. 31
  31. 62
  32. 71
  33. 40
  34. 110
  35. 15
  36. 95
  37. 17
  38. 144
  39. 20
  40. 122

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