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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 391 · 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 37 =
  2. 2.Double 32 =
  3. 3.Half of 102 =
  4. 4.Half of 98 =
  5. 5.Half of 32 =
  6. 6.Half of 124 =
  7. 7.Double 41 =
  8. 8.Double 52 =
  9. 9.Double 86 =
  10. 10.Half of 58 =
  11. 11.Half of 172 =
  12. 12.Double 69 =
  13. 13.Half of 188 =
  14. 14.Double 99 =
  15. 15.Half of 38 =
  16. 16.Half of 178 =
  17. 17.Half of 56 =
  18. 18.Double 48 =
  19. 19.Double 24 =
  20. 20.Half of 146 =
  21. 21.Half of 166 =
  22. 22.Double 94 =
  23. 23.Double 63 =
  24. 24.Half of 110 =
  25. 25.Half of 78 =
  26. 26.Double 96 =
  27. 27.Double 51 =
  28. 28.Half of 194 =
  29. 29.Half of 64 =
  30. 30.Double 66 =
  31. 31.Half of 118 =
  32. 32.Double 17 =
  33. 33.Half of 74 =
  34. 34.Half of 40 =
  35. 35.Double 26 =
  36. 36.Double 71 =
  37. 37.Half of 130 =
  38. 38.Half of 88 =
  39. 39.Half of 70 =
  40. 40.Double 31 =

Answer key

  1. 74
  2. 64
  3. 51
  4. 49
  5. 16
  6. 62
  7. 82
  8. 104
  9. 172
  10. 29
  11. 86
  12. 138
  13. 94
  14. 198
  15. 19
  16. 89
  17. 28
  18. 96
  19. 48
  20. 73
  21. 83
  22. 188
  23. 126
  24. 55
  25. 39
  26. 192
  27. 102
  28. 97
  29. 32
  30. 132
  31. 59
  32. 34
  33. 37
  34. 20
  35. 52
  36. 142
  37. 65
  38. 44
  39. 35
  40. 62

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