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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 209 · 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 22 =
  2. 2.Half of 122 =
  3. 3.Double 57 =
  4. 4.Half of 150 =
  5. 5.Half of 156 =
  6. 6.Double 53 =
  7. 7.Half of 100 =
  8. 8.Double 78 =
  9. 9.Double 71 =
  10. 10.Half of 104 =
  11. 11.Double 58 =
  12. 12.Double 63 =
  13. 13.Double 92 =
  14. 14.Double 23 =
  15. 15.Double 91 =
  16. 16.Double 48 =
  17. 17.Half of 76 =
  18. 18.Double 54 =
  19. 19.Double 73 =
  20. 20.Half of 194 =
  21. 21.Half of 148 =
  22. 22.Double 34 =
  23. 23.Double 52 =
  24. 24.Half of 178 =
  25. 25.Half of 190 =
  26. 26.Double 38 =
  27. 27.Double 18 =
  28. 28.Half of 58 =
  29. 29.Half of 52 =
  30. 30.Half of 44 =
  31. 31.Half of 142 =
  32. 32.Half of 138 =
  33. 33.Double 47 =
  34. 34.Half of 74 =
  35. 35.Double 36 =
  36. 36.Half of 62 =
  37. 37.Double 35 =
  38. 38.Double 41 =
  39. 39.Double 27 =
  40. 40.Double 87 =

Answer key

  1. 44
  2. 61
  3. 114
  4. 75
  5. 78
  6. 106
  7. 50
  8. 156
  9. 142
  10. 52
  11. 116
  12. 126
  13. 184
  14. 46
  15. 182
  16. 96
  17. 38
  18. 108
  19. 146
  20. 97
  21. 74
  22. 68
  23. 104
  24. 89
  25. 95
  26. 76
  27. 36
  28. 29
  29. 26
  30. 22
  31. 71
  32. 69
  33. 94
  34. 37
  35. 72
  36. 31
  37. 70
  38. 82
  39. 54
  40. 174

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