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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 340 · 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 84 =
  2. 2.Double 86 =
  3. 3.Double 85 =
  4. 4.Double 88 =
  5. 5.Half of 146 =
  6. 6.Half of 180 =
  7. 7.Double 16 =
  8. 8.Double 98 =
  9. 9.Half of 34 =
  10. 10.Half of 72 =
  11. 11.Double 26 =
  12. 12.Double 48 =
  13. 13.Half of 104 =
  14. 14.Double 81 =
  15. 15.Half of 164 =
  16. 16.Half of 62 =
  17. 17.Double 17 =
  18. 18.Double 46 =
  19. 19.Half of 128 =
  20. 20.Double 87 =
  21. 21.Half of 76 =
  22. 22.Half of 194 =
  23. 23.Half of 156 =
  24. 24.Half of 28 =
  25. 25.Half of 48 =
  26. 26.Half of 174 =
  27. 27.Double 35 =
  28. 28.Half of 124 =
  29. 29.Double 33 =
  30. 30.Double 32 =
  31. 31.Double 51 =
  32. 32.Half of 36 =
  33. 33.Double 67 =
  34. 34.Half of 196 =
  35. 35.Double 37 =
  36. 36.Half of 106 =
  37. 37.Double 63 =
  38. 38.Half of 42 =
  39. 39.Half of 102 =
  40. 40.Half of 126 =

Answer key

  1. 168
  2. 172
  3. 170
  4. 176
  5. 73
  6. 90
  7. 32
  8. 196
  9. 17
  10. 36
  11. 52
  12. 96
  13. 52
  14. 162
  15. 82
  16. 31
  17. 34
  18. 92
  19. 64
  20. 174
  21. 38
  22. 97
  23. 78
  24. 14
  25. 24
  26. 87
  27. 70
  28. 62
  29. 66
  30. 64
  31. 102
  32. 18
  33. 134
  34. 98
  35. 74
  36. 53
  37. 126
  38. 21
  39. 51
  40. 63

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