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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 719 · 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 29 =
  2. 2.Double 44 =
  3. 3.Double 82 =
  4. 4.Half of 102 =
  5. 5.Half of 190 =
  6. 6.Double 33 =
  7. 7.Half of 116 =
  8. 8.Half of 166 =
  9. 9.Half of 100 =
  10. 10.Double 78 =
  11. 11.Half of 194 =
  12. 12.Double 39 =
  13. 13.Double 18 =
  14. 14.Double 41 =
  15. 15.Half of 98 =
  16. 16.Double 63 =
  17. 17.Half of 46 =
  18. 18.Half of 178 =
  19. 19.Double 32 =
  20. 20.Double 79 =
  21. 21.Double 61 =
  22. 22.Half of 42 =
  23. 23.Half of 52 =
  24. 24.Double 65 =
  25. 25.Double 28 =
  26. 26.Double 51 =
  27. 27.Double 59 =
  28. 28.Half of 162 =
  29. 29.Half of 142 =
  30. 30.Half of 86 =
  31. 31.Half of 36 =
  32. 32.Half of 110 =
  33. 33.Double 64 =
  34. 34.Half of 156 =
  35. 35.Double 98 =
  36. 36.Half of 168 =
  37. 37.Double 58 =
  38. 38.Half of 50 =
  39. 39.Double 21 =
  40. 40.Double 76 =

Answer key

  1. 58
  2. 88
  3. 164
  4. 51
  5. 95
  6. 66
  7. 58
  8. 83
  9. 50
  10. 156
  11. 97
  12. 78
  13. 36
  14. 82
  15. 49
  16. 126
  17. 23
  18. 89
  19. 64
  20. 158
  21. 122
  22. 21
  23. 26
  24. 130
  25. 56
  26. 102
  27. 118
  28. 81
  29. 71
  30. 43
  31. 18
  32. 55
  33. 128
  34. 78
  35. 196
  36. 84
  37. 116
  38. 25
  39. 42
  40. 152

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