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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 72 · 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 142 =
  2. 2.Half of 164 =
  3. 3.Half of 78 =
  4. 4.Half of 26 =
  5. 5.Double 83 =
  6. 6.Double 27 =
  7. 7.Double 44 =
  8. 8.Double 75 =
  9. 9.Double 76 =
  10. 10.Double 23 =
  11. 11.Double 32 =
  12. 12.Double 34 =
  13. 13.Double 59 =
  14. 14.Double 42 =
  15. 15.Half of 96 =
  16. 16.Half of 128 =
  17. 17.Double 64 =
  18. 18.Double 78 =
  19. 19.Half of 44 =
  20. 20.Half of 122 =
  21. 21.Half of 58 =
  22. 22.Double 22 =
  23. 23.Double 51 =
  24. 24.Half of 70 =
  25. 25.Half of 194 =
  26. 26.Double 87 =
  27. 27.Half of 148 =
  28. 28.Double 67 =
  29. 29.Double 29 =
  30. 30.Half of 80 =
  31. 31.Double 86 =
  32. 32.Half of 138 =
  33. 33.Half of 180 =
  34. 34.Double 98 =
  35. 35.Half of 192 =
  36. 36.Half of 30 =
  37. 37.Half of 126 =
  38. 38.Double 48 =
  39. 39.Half of 100 =
  40. 40.Double 68 =

Answer key

  1. 71
  2. 82
  3. 39
  4. 13
  5. 166
  6. 54
  7. 88
  8. 150
  9. 152
  10. 46
  11. 64
  12. 68
  13. 118
  14. 84
  15. 48
  16. 64
  17. 128
  18. 156
  19. 22
  20. 61
  21. 29
  22. 44
  23. 102
  24. 35
  25. 97
  26. 174
  27. 74
  28. 134
  29. 58
  30. 40
  31. 172
  32. 69
  33. 90
  34. 196
  35. 96
  36. 15
  37. 63
  38. 96
  39. 50
  40. 136

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