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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 370 · 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 80 =
  2. 2.Double 49 =
  3. 3.Double 39 =
  4. 4.Half of 34 =
  5. 5.Half of 198 =
  6. 6.Half of 150 =
  7. 7.Half of 130 =
  8. 8.Double 92 =
  9. 9.Half of 82 =
  10. 10.Double 96 =
  11. 11.Half of 120 =
  12. 12.Double 68 =
  13. 13.Half of 72 =
  14. 14.Double 41 =
  15. 15.Half of 148 =
  16. 16.Double 31 =
  17. 17.Half of 32 =
  18. 18.Half of 46 =
  19. 19.Double 28 =
  20. 20.Double 51 =
  21. 21.Half of 112 =
  22. 22.Half of 134 =
  23. 23.Half of 90 =
  24. 24.Half of 58 =
  25. 25.Half of 54 =
  26. 26.Double 65 =
  27. 27.Double 36 =
  28. 28.Double 42 =
  29. 29.Double 17 =
  30. 30.Half of 196 =
  31. 31.Half of 88 =
  32. 32.Double 73 =
  33. 33.Half of 118 =
  34. 34.Half of 108 =
  35. 35.Half of 42 =
  36. 36.Double 87 =
  37. 37.Half of 164 =
  38. 38.Double 93 =
  39. 39.Half of 92 =
  40. 40.Double 69 =

Answer key

  1. 40
  2. 98
  3. 78
  4. 17
  5. 99
  6. 75
  7. 65
  8. 184
  9. 41
  10. 192
  11. 60
  12. 136
  13. 36
  14. 82
  15. 74
  16. 62
  17. 16
  18. 23
  19. 56
  20. 102
  21. 56
  22. 67
  23. 45
  24. 29
  25. 27
  26. 130
  27. 72
  28. 84
  29. 34
  30. 98
  31. 44
  32. 146
  33. 59
  34. 54
  35. 21
  36. 174
  37. 82
  38. 186
  39. 46
  40. 138

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