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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 471 · 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 99 =
  2. 2.Half of 106 =
  3. 3.Double 81 =
  4. 4.Double 53 =
  5. 5.Double 21 =
  6. 6.Half of 124 =
  7. 7.Half of 54 =
  8. 8.Double 83 =
  9. 9.Double 35 =
  10. 10.Double 63 =
  11. 11.Double 84 =
  12. 12.Half of 76 =
  13. 13.Double 34 =
  14. 14.Half of 154 =
  15. 15.Half of 56 =
  16. 16.Half of 194 =
  17. 17.Half of 122 =
  18. 18.Double 28 =
  19. 19.Half of 40 =
  20. 20.Half of 188 =
  21. 21.Half of 98 =
  22. 22.Half of 34 =
  23. 23.Double 75 =
  24. 24.Double 64 =
  25. 25.Double 31 =
  26. 26.Half of 198 =
  27. 27.Half of 50 =
  28. 28.Double 26 =
  29. 29.Double 51 =
  30. 30.Double 98 =
  31. 31.Half of 44 =
  32. 32.Half of 30 =
  33. 33.Half of 176 =
  34. 34.Half of 68 =
  35. 35.Half of 132 =
  36. 36.Half of 164 =
  37. 37.Half of 48 =
  38. 38.Half of 150 =
  39. 39.Double 88 =
  40. 40.Double 37 =

Answer key

  1. 198
  2. 53
  3. 162
  4. 106
  5. 42
  6. 62
  7. 27
  8. 166
  9. 70
  10. 126
  11. 168
  12. 38
  13. 68
  14. 77
  15. 28
  16. 97
  17. 61
  18. 56
  19. 20
  20. 94
  21. 49
  22. 17
  23. 150
  24. 128
  25. 62
  26. 99
  27. 25
  28. 52
  29. 102
  30. 196
  31. 22
  32. 15
  33. 88
  34. 34
  35. 66
  36. 82
  37. 24
  38. 75
  39. 176
  40. 74

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