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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 764 · 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 94 =
  2. 2.Half of 114 =
  3. 3.Double 79 =
  4. 4.Half of 32 =
  5. 5.Double 57 =
  6. 6.Half of 54 =
  7. 7.Double 21 =
  8. 8.Double 47 =
  9. 9.Half of 186 =
  10. 10.Half of 130 =
  11. 11.Half of 70 =
  12. 12.Half of 80 =
  13. 13.Double 71 =
  14. 14.Half of 198 =
  15. 15.Double 64 =
  16. 16.Double 44 =
  17. 17.Double 34 =
  18. 18.Half of 68 =
  19. 19.Double 92 =
  20. 20.Half of 72 =
  21. 21.Double 53 =
  22. 22.Half of 58 =
  23. 23.Double 42 =
  24. 24.Half of 40 =
  25. 25.Half of 42 =
  26. 26.Double 63 =
  27. 27.Double 58 =
  28. 28.Double 81 =
  29. 29.Double 66 =
  30. 30.Half of 28 =
  31. 31.Double 96 =
  32. 32.Double 28 =
  33. 33.Half of 128 =
  34. 34.Half of 118 =
  35. 35.Double 95 =
  36. 36.Half of 160 =
  37. 37.Double 74 =
  38. 38.Half of 194 =
  39. 39.Half of 52 =
  40. 40.Double 25 =

Answer key

  1. 188
  2. 57
  3. 158
  4. 16
  5. 114
  6. 27
  7. 42
  8. 94
  9. 93
  10. 65
  11. 35
  12. 40
  13. 142
  14. 99
  15. 128
  16. 88
  17. 68
  18. 34
  19. 184
  20. 36
  21. 106
  22. 29
  23. 84
  24. 20
  25. 21
  26. 126
  27. 116
  28. 162
  29. 132
  30. 14
  31. 192
  32. 56
  33. 64
  34. 59
  35. 190
  36. 80
  37. 148
  38. 97
  39. 26
  40. 50

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