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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 467 · 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.Half of 142 =
  2. 2.Half of 102 =
  3. 3.Half of 136 =
  4. 4.Half of 196 =
  5. 5.Double 39 =
  6. 6.Double 97 =
  7. 7.Half of 170 =
  8. 8.Double 73 =
  9. 9.Double 32 =
  10. 10.Double 87 =
  11. 11.Double 33 =
  12. 12.Double 63 =
  13. 13.Half of 144 =
  14. 14.Half of 162 =
  15. 15.Double 27 =
  16. 16.Half of 72 =
  17. 17.Double 21 =
  18. 18.Half of 64 =
  19. 19.Half of 90 =
  20. 20.Double 58 =
  21. 21.Half of 180 =
  22. 22.Half of 52 =
  23. 23.Double 41 =
  24. 24.Double 44 =
  25. 25.Half of 168 =
  26. 26.Half of 48 =
  27. 27.Double 92 =
  28. 28.Half of 98 =
  29. 29.Double 25 =
  30. 30.Double 62 =
  31. 31.Half of 30 =
  32. 32.Double 69 =
  33. 33.Half of 150 =
  34. 34.Double 22 =
  35. 35.Double 23 =
  36. 36.Half of 152 =
  37. 37.Half of 36 =
  38. 38.Double 28 =
  39. 39.Half of 44 =
  40. 40.Half of 116 =

Answer key

  1. 71
  2. 51
  3. 68
  4. 98
  5. 78
  6. 194
  7. 85
  8. 146
  9. 64
  10. 174
  11. 66
  12. 126
  13. 72
  14. 81
  15. 54
  16. 36
  17. 42
  18. 32
  19. 45
  20. 116
  21. 90
  22. 26
  23. 82
  24. 88
  25. 84
  26. 24
  27. 184
  28. 49
  29. 50
  30. 124
  31. 15
  32. 138
  33. 75
  34. 44
  35. 46
  36. 76
  37. 18
  38. 56
  39. 22
  40. 58

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