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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 150 · 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 164 =
  2. 2.Double 73 =
  3. 3.Half of 68 =
  4. 4.Double 95 =
  5. 5.Double 49 =
  6. 6.Half of 94 =
  7. 7.Double 61 =
  8. 8.Double 57 =
  9. 9.Double 78 =
  10. 10.Half of 146 =
  11. 11.Double 81 =
  12. 12.Double 31 =
  13. 13.Double 51 =
  14. 14.Half of 126 =
  15. 15.Double 88 =
  16. 16.Half of 132 =
  17. 17.Double 26 =
  18. 18.Half of 156 =
  19. 19.Double 68 =
  20. 20.Half of 56 =
  21. 21.Double 35 =
  22. 22.Double 71 =
  23. 23.Double 17 =
  24. 24.Double 52 =
  25. 25.Double 33 =
  26. 26.Half of 100 =
  27. 27.Double 97 =
  28. 28.Half of 76 =
  29. 29.Half of 192 =
  30. 30.Half of 74 =
  31. 31.Half of 128 =
  32. 32.Half of 86 =
  33. 33.Double 18 =
  34. 34.Half of 42 =
  35. 35.Double 39 =
  36. 36.Half of 34 =
  37. 37.Double 69 =
  38. 38.Double 19 =
  39. 39.Double 56 =
  40. 40.Double 87 =

Answer key

  1. 82
  2. 146
  3. 34
  4. 190
  5. 98
  6. 47
  7. 122
  8. 114
  9. 156
  10. 73
  11. 162
  12. 62
  13. 102
  14. 63
  15. 176
  16. 66
  17. 52
  18. 78
  19. 136
  20. 28
  21. 70
  22. 142
  23. 34
  24. 104
  25. 66
  26. 50
  27. 194
  28. 38
  29. 96
  30. 37
  31. 64
  32. 43
  33. 36
  34. 21
  35. 78
  36. 17
  37. 138
  38. 38
  39. 112
  40. 174

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