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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 233 · 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 35 =
  2. 2.Double 43 =
  3. 3.Double 63 =
  4. 4.Double 34 =
  5. 5.Half of 106 =
  6. 6.Half of 34 =
  7. 7.Double 91 =
  8. 8.Half of 74 =
  9. 9.Half of 156 =
  10. 10.Half of 48 =
  11. 11.Half of 32 =
  12. 12.Double 44 =
  13. 13.Half of 194 =
  14. 14.Half of 88 =
  15. 15.Half of 50 =
  16. 16.Double 87 =
  17. 17.Half of 136 =
  18. 18.Half of 62 =
  19. 19.Half of 64 =
  20. 20.Double 98 =
  21. 21.Double 71 =
  22. 22.Half of 158 =
  23. 23.Double 17 =
  24. 24.Half of 182 =
  25. 25.Double 28 =
  26. 26.Half of 186 =
  27. 27.Double 23 =
  28. 28.Half of 112 =
  29. 29.Double 18 =
  30. 30.Double 45 =
  31. 31.Half of 54 =
  32. 32.Double 67 =
  33. 33.Half of 46 =
  34. 34.Half of 92 =
  35. 35.Double 64 =
  36. 36.Double 61 =
  37. 37.Double 31 =
  38. 38.Half of 30 =
  39. 39.Double 33 =
  40. 40.Double 86 =

Answer key

  1. 70
  2. 86
  3. 126
  4. 68
  5. 53
  6. 17
  7. 182
  8. 37
  9. 78
  10. 24
  11. 16
  12. 88
  13. 97
  14. 44
  15. 25
  16. 174
  17. 68
  18. 31
  19. 32
  20. 196
  21. 142
  22. 79
  23. 34
  24. 91
  25. 56
  26. 93
  27. 46
  28. 56
  29. 36
  30. 90
  31. 27
  32. 134
  33. 23
  34. 46
  35. 128
  36. 122
  37. 62
  38. 15
  39. 66
  40. 172

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