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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 648 · 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 24 =
  2. 2.Double 32 =
  3. 3.Half of 86 =
  4. 4.Half of 192 =
  5. 5.Double 36 =
  6. 6.Double 99 =
  7. 7.Half of 40 =
  8. 8.Double 35 =
  9. 9.Half of 166 =
  10. 10.Half of 96 =
  11. 11.Double 44 =
  12. 12.Double 95 =
  13. 13.Half of 94 =
  14. 14.Half of 196 =
  15. 15.Double 56 =
  16. 16.Half of 108 =
  17. 17.Double 82 =
  18. 18.Half of 100 =
  19. 19.Half of 104 =
  20. 20.Half of 48 =
  21. 21.Half of 30 =
  22. 22.Half of 140 =
  23. 23.Half of 32 =
  24. 24.Half of 198 =
  25. 25.Double 16 =
  26. 26.Half of 66 =
  27. 27.Half of 34 =
  28. 28.Half of 74 =
  29. 29.Double 31 =
  30. 30.Double 49 =
  31. 31.Double 88 =
  32. 32.Double 76 =
  33. 33.Double 18 =
  34. 34.Half of 112 =
  35. 35.Double 75 =
  36. 36.Half of 170 =
  37. 37.Half of 190 =
  38. 38.Half of 130 =
  39. 39.Double 38 =
  40. 40.Double 22 =

Answer key

  1. 48
  2. 64
  3. 43
  4. 96
  5. 72
  6. 198
  7. 20
  8. 70
  9. 83
  10. 48
  11. 88
  12. 190
  13. 47
  14. 98
  15. 112
  16. 54
  17. 164
  18. 50
  19. 52
  20. 24
  21. 15
  22. 70
  23. 16
  24. 99
  25. 32
  26. 33
  27. 17
  28. 37
  29. 62
  30. 98
  31. 176
  32. 152
  33. 36
  34. 56
  35. 150
  36. 85
  37. 95
  38. 65
  39. 76
  40. 44

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