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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 126 · 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 86 =
  2. 2.Double 78 =
  3. 3.Double 22 =
  4. 4.Half of 148 =
  5. 5.Half of 116 =
  6. 6.Double 71 =
  7. 7.Half of 126 =
  8. 8.Double 28 =
  9. 9.Half of 94 =
  10. 10.Half of 180 =
  11. 11.Half of 46 =
  12. 12.Double 63 =
  13. 13.Half of 114 =
  14. 14.Half of 52 =
  15. 15.Double 47 =
  16. 16.Half of 160 =
  17. 17.Double 62 =
  18. 18.Half of 182 =
  19. 19.Half of 30 =
  20. 20.Half of 196 =
  21. 21.Double 92 =
  22. 22.Double 16 =
  23. 23.Double 81 =
  24. 24.Double 17 =
  25. 25.Half of 70 =
  26. 26.Double 31 =
  27. 27.Double 94 =
  28. 28.Double 64 =
  29. 29.Double 25 =
  30. 30.Half of 64 =
  31. 31.Double 72 =
  32. 32.Double 27 =
  33. 33.Half of 48 =
  34. 34.Double 32 =
  35. 35.Double 53 =
  36. 36.Half of 34 =
  37. 37.Double 57 =
  38. 38.Double 97 =
  39. 39.Double 34 =
  40. 40.Double 67 =

Answer key

  1. 43
  2. 156
  3. 44
  4. 74
  5. 58
  6. 142
  7. 63
  8. 56
  9. 47
  10. 90
  11. 23
  12. 126
  13. 57
  14. 26
  15. 94
  16. 80
  17. 124
  18. 91
  19. 15
  20. 98
  21. 184
  22. 32
  23. 162
  24. 34
  25. 35
  26. 62
  27. 188
  28. 128
  29. 50
  30. 32
  31. 144
  32. 54
  33. 24
  34. 64
  35. 106
  36. 17
  37. 114
  38. 194
  39. 68
  40. 134

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