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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 829 · 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 168 =
  2. 2.Double 57 =
  3. 3.Half of 60 =
  4. 4.Double 39 =
  5. 5.Double 56 =
  6. 6.Half of 110 =
  7. 7.Double 73 =
  8. 8.Double 83 =
  9. 9.Double 22 =
  10. 10.Double 51 =
  11. 11.Double 29 =
  12. 12.Half of 94 =
  13. 13.Double 72 =
  14. 14.Half of 192 =
  15. 15.Half of 74 =
  16. 16.Half of 64 =
  17. 17.Double 87 =
  18. 18.Half of 194 =
  19. 19.Half of 136 =
  20. 20.Half of 150 =
  21. 21.Double 58 =
  22. 22.Half of 56 =
  23. 23.Double 94 =
  24. 24.Double 55 =
  25. 25.Double 88 =
  26. 26.Double 63 =
  27. 27.Double 69 =
  28. 28.Half of 198 =
  29. 29.Half of 188 =
  30. 30.Half of 172 =
  31. 31.Half of 148 =
  32. 32.Double 36 =
  33. 33.Half of 106 =
  34. 34.Half of 122 =
  35. 35.Double 64 =
  36. 36.Double 85 =
  37. 37.Double 67 =
  38. 38.Half of 156 =
  39. 39.Double 92 =
  40. 40.Half of 92 =

Answer key

  1. 84
  2. 114
  3. 30
  4. 78
  5. 112
  6. 55
  7. 146
  8. 166
  9. 44
  10. 102
  11. 58
  12. 47
  13. 144
  14. 96
  15. 37
  16. 32
  17. 174
  18. 97
  19. 68
  20. 75
  21. 116
  22. 28
  23. 188
  24. 110
  25. 176
  26. 126
  27. 138
  28. 99
  29. 94
  30. 86
  31. 74
  32. 72
  33. 53
  34. 61
  35. 128
  36. 170
  37. 134
  38. 78
  39. 184
  40. 46

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