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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 310 · 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 55 =
  2. 2.Half of 38 =
  3. 3.Double 49 =
  4. 4.Double 19 =
  5. 5.Double 37 =
  6. 6.Half of 168 =
  7. 7.Half of 80 =
  8. 8.Double 31 =
  9. 9.Double 74 =
  10. 10.Half of 90 =
  11. 11.Double 21 =
  12. 12.Half of 118 =
  13. 13.Double 22 =
  14. 14.Half of 96 =
  15. 15.Double 44 =
  16. 16.Double 88 =
  17. 17.Double 18 =
  18. 18.Double 27 =
  19. 19.Half of 130 =
  20. 20.Half of 102 =
  21. 21.Double 39 =
  22. 22.Half of 140 =
  23. 23.Half of 178 =
  24. 24.Half of 116 =
  25. 25.Double 77 =
  26. 26.Half of 112 =
  27. 27.Double 68 =
  28. 28.Half of 68 =
  29. 29.Half of 104 =
  30. 30.Double 51 =
  31. 31.Half of 84 =
  32. 32.Half of 94 =
  33. 33.Half of 70 =
  34. 34.Double 81 =
  35. 35.Half of 60 =
  36. 36.Double 25 =
  37. 37.Half of 52 =
  38. 38.Half of 98 =
  39. 39.Double 84 =
  40. 40.Double 48 =

Answer key

  1. 110
  2. 19
  3. 98
  4. 38
  5. 74
  6. 84
  7. 40
  8. 62
  9. 148
  10. 45
  11. 42
  12. 59
  13. 44
  14. 48
  15. 88
  16. 176
  17. 36
  18. 54
  19. 65
  20. 51
  21. 78
  22. 70
  23. 89
  24. 58
  25. 154
  26. 56
  27. 136
  28. 34
  29. 52
  30. 102
  31. 42
  32. 47
  33. 35
  34. 162
  35. 30
  36. 50
  37. 26
  38. 49
  39. 168
  40. 96

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