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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 224 · 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 19 =
  2. 2.Double 46 =
  3. 3.Half of 48 =
  4. 4.Double 74 =
  5. 5.Half of 26 =
  6. 6.Double 21 =
  7. 7.Double 98 =
  8. 8.Half of 138 =
  9. 9.Double 69 =
  10. 10.Double 37 =
  11. 11.Double 83 =
  12. 12.Double 16 =
  13. 13.Half of 126 =
  14. 14.Half of 170 =
  15. 15.Double 97 =
  16. 16.Double 31 =
  17. 17.Half of 94 =
  18. 18.Half of 92 =
  19. 19.Half of 186 =
  20. 20.Double 35 =
  21. 21.Half of 70 =
  22. 22.Double 75 =
  23. 23.Half of 96 =
  24. 24.Half of 28 =
  25. 25.Double 73 =
  26. 26.Half of 68 =
  27. 27.Double 96 =
  28. 28.Double 55 =
  29. 29.Double 28 =
  30. 30.Double 57 =
  31. 31.Half of 56 =
  32. 32.Half of 32 =
  33. 33.Half of 78 =
  34. 34.Double 76 =
  35. 35.Half of 38 =
  36. 36.Half of 72 =
  37. 37.Half of 128 =
  38. 38.Half of 152 =
  39. 39.Double 65 =
  40. 40.Double 39 =

Answer key

  1. 38
  2. 92
  3. 24
  4. 148
  5. 13
  6. 42
  7. 196
  8. 69
  9. 138
  10. 74
  11. 166
  12. 32
  13. 63
  14. 85
  15. 194
  16. 62
  17. 47
  18. 46
  19. 93
  20. 70
  21. 35
  22. 150
  23. 48
  24. 14
  25. 146
  26. 34
  27. 192
  28. 110
  29. 56
  30. 114
  31. 28
  32. 16
  33. 39
  34. 152
  35. 19
  36. 36
  37. 64
  38. 76
  39. 130
  40. 78

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