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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 69 · 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 79 =
  2. 2.Double 77 =
  3. 3.Double 26 =
  4. 4.Half of 130 =
  5. 5.Half of 26 =
  6. 6.Half of 112 =
  7. 7.Half of 188 =
  8. 8.Double 95 =
  9. 9.Double 19 =
  10. 10.Double 35 =
  11. 11.Half of 42 =
  12. 12.Half of 144 =
  13. 13.Double 38 =
  14. 14.Double 97 =
  15. 15.Half of 52 =
  16. 16.Half of 174 =
  17. 17.Double 22 =
  18. 18.Double 34 =
  19. 19.Half of 152 =
  20. 20.Double 65 =
  21. 21.Double 33 =
  22. 22.Half of 54 =
  23. 23.Double 42 =
  24. 24.Half of 134 =
  25. 25.Half of 192 =
  26. 26.Half of 118 =
  27. 27.Half of 104 =
  28. 28.Half of 108 =
  29. 29.Double 55 =
  30. 30.Half of 128 =
  31. 31.Half of 72 =
  32. 32.Double 96 =
  33. 33.Half of 38 =
  34. 34.Double 21 =
  35. 35.Double 47 =
  36. 36.Double 87 =
  37. 37.Half of 156 =
  38. 38.Double 52 =
  39. 39.Double 51 =
  40. 40.Half of 122 =

Answer key

  1. 158
  2. 154
  3. 52
  4. 65
  5. 13
  6. 56
  7. 94
  8. 190
  9. 38
  10. 70
  11. 21
  12. 72
  13. 76
  14. 194
  15. 26
  16. 87
  17. 44
  18. 68
  19. 76
  20. 130
  21. 66
  22. 27
  23. 84
  24. 67
  25. 96
  26. 59
  27. 52
  28. 54
  29. 110
  30. 64
  31. 36
  32. 192
  33. 19
  34. 42
  35. 94
  36. 174
  37. 78
  38. 104
  39. 102
  40. 61

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