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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 779 · 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 128 =
  2. 2.Double 74 =
  3. 3.Half of 182 =
  4. 4.Double 71 =
  5. 5.Double 65 =
  6. 6.Half of 158 =
  7. 7.Half of 32 =
  8. 8.Double 38 =
  9. 9.Double 75 =
  10. 10.Double 97 =
  11. 11.Half of 188 =
  12. 12.Double 52 =
  13. 13.Half of 76 =
  14. 14.Double 42 =
  15. 15.Half of 142 =
  16. 16.Half of 166 =
  17. 17.Half of 156 =
  18. 18.Half of 66 =
  19. 19.Double 39 =
  20. 20.Double 98 =
  21. 21.Half of 34 =
  22. 22.Half of 26 =
  23. 23.Double 36 =
  24. 24.Double 49 =
  25. 25.Double 82 =
  26. 26.Double 23 =
  27. 27.Double 88 =
  28. 28.Double 85 =
  29. 29.Half of 184 =
  30. 30.Half of 140 =
  31. 31.Double 59 =
  32. 32.Half of 64 =
  33. 33.Half of 70 =
  34. 34.Double 21 =
  35. 35.Double 62 =
  36. 36.Double 92 =
  37. 37.Double 47 =
  38. 38.Half of 104 =
  39. 39.Double 26 =
  40. 40.Double 31 =

Answer key

  1. 64
  2. 148
  3. 91
  4. 142
  5. 130
  6. 79
  7. 16
  8. 76
  9. 150
  10. 194
  11. 94
  12. 104
  13. 38
  14. 84
  15. 71
  16. 83
  17. 78
  18. 33
  19. 78
  20. 196
  21. 17
  22. 13
  23. 72
  24. 98
  25. 164
  26. 46
  27. 176
  28. 170
  29. 92
  30. 70
  31. 118
  32. 32
  33. 35
  34. 42
  35. 124
  36. 184
  37. 94
  38. 52
  39. 52
  40. 62

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