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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 572 · 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 52 =
  2. 2.Double 53 =
  3. 3.Double 22 =
  4. 4.Double 81 =
  5. 5.Half of 158 =
  6. 6.Double 38 =
  7. 7.Double 87 =
  8. 8.Double 42 =
  9. 9.Half of 74 =
  10. 10.Half of 182 =
  11. 11.Double 86 =
  12. 12.Double 41 =
  13. 13.Half of 56 =
  14. 14.Double 24 =
  15. 15.Half of 72 =
  16. 16.Half of 80 =
  17. 17.Double 23 =
  18. 18.Half of 188 =
  19. 19.Double 82 =
  20. 20.Half of 194 =
  21. 21.Double 58 =
  22. 22.Double 75 =
  23. 23.Double 35 =
  24. 24.Half of 50 =
  25. 25.Half of 66 =
  26. 26.Half of 44 =
  27. 27.Double 61 =
  28. 28.Half of 38 =
  29. 29.Half of 94 =
  30. 30.Double 88 =
  31. 31.Half of 88 =
  32. 32.Double 21 =
  33. 33.Half of 54 =
  34. 34.Double 36 =
  35. 35.Double 33 =
  36. 36.Double 34 =
  37. 37.Half of 64 =
  38. 38.Double 93 =
  39. 39.Half of 78 =
  40. 40.Half of 70 =

Answer key

  1. 104
  2. 106
  3. 44
  4. 162
  5. 79
  6. 76
  7. 174
  8. 84
  9. 37
  10. 91
  11. 172
  12. 82
  13. 28
  14. 48
  15. 36
  16. 40
  17. 46
  18. 94
  19. 164
  20. 97
  21. 116
  22. 150
  23. 70
  24. 25
  25. 33
  26. 22
  27. 122
  28. 19
  29. 47
  30. 176
  31. 44
  32. 42
  33. 27
  34. 72
  35. 66
  36. 68
  37. 32
  38. 186
  39. 39
  40. 35

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