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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 223 · 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 130 =
  2. 2.Half of 120 =
  3. 3.Double 54 =
  4. 4.Half of 162 =
  5. 5.Half of 66 =
  6. 6.Half of 198 =
  7. 7.Half of 26 =
  8. 8.Half of 144 =
  9. 9.Half of 190 =
  10. 10.Double 75 =
  11. 11.Double 37 =
  12. 12.Half of 96 =
  13. 13.Double 95 =
  14. 14.Double 92 =
  15. 15.Double 51 =
  16. 16.Double 36 =
  17. 17.Double 98 =
  18. 18.Half of 140 =
  19. 19.Half of 126 =
  20. 20.Half of 56 =
  21. 21.Half of 94 =
  22. 22.Double 22 =
  23. 23.Double 76 =
  24. 24.Half of 150 =
  25. 25.Double 39 =
  26. 26.Double 33 =
  27. 27.Half of 98 =
  28. 28.Double 97 =
  29. 29.Double 48 =
  30. 30.Half of 38 =
  31. 31.Half of 138 =
  32. 32.Double 41 =
  33. 33.Double 96 =
  34. 34.Double 56 =
  35. 35.Half of 86 =
  36. 36.Half of 40 =
  37. 37.Double 24 =
  38. 38.Double 67 =
  39. 39.Double 61 =
  40. 40.Half of 48 =

Answer key

  1. 65
  2. 60
  3. 108
  4. 81
  5. 33
  6. 99
  7. 13
  8. 72
  9. 95
  10. 150
  11. 74
  12. 48
  13. 190
  14. 184
  15. 102
  16. 72
  17. 196
  18. 70
  19. 63
  20. 28
  21. 47
  22. 44
  23. 152
  24. 75
  25. 78
  26. 66
  27. 49
  28. 194
  29. 96
  30. 19
  31. 69
  32. 82
  33. 192
  34. 112
  35. 43
  36. 20
  37. 48
  38. 134
  39. 122
  40. 24

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