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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 36 · 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 44 =
  2. 2.Half of 48 =
  3. 3.Half of 132 =
  4. 4.Half of 154 =
  5. 5.Half of 62 =
  6. 6.Half of 52 =
  7. 7.Half of 128 =
  8. 8.Half of 42 =
  9. 9.Double 88 =
  10. 10.Double 51 =
  11. 11.Half of 140 =
  12. 12.Double 28 =
  13. 13.Double 42 =
  14. 14.Double 49 =
  15. 15.Half of 44 =
  16. 16.Double 93 =
  17. 17.Double 87 =
  18. 18.Double 72 =
  19. 19.Double 61 =
  20. 20.Double 17 =
  21. 21.Double 31 =
  22. 22.Half of 122 =
  23. 23.Double 19 =
  24. 24.Double 33 =
  25. 25.Half of 56 =
  26. 26.Double 53 =
  27. 27.Half of 192 =
  28. 28.Double 35 =
  29. 29.Half of 72 =
  30. 30.Double 69 =
  31. 31.Half of 196 =
  32. 32.Half of 70 =
  33. 33.Double 65 =
  34. 34.Double 27 =
  35. 35.Half of 124 =
  36. 36.Double 38 =
  37. 37.Half of 90 =
  38. 38.Half of 94 =
  39. 39.Half of 100 =
  40. 40.Double 78 =

Answer key

  1. 88
  2. 24
  3. 66
  4. 77
  5. 31
  6. 26
  7. 64
  8. 21
  9. 176
  10. 102
  11. 70
  12. 56
  13. 84
  14. 98
  15. 22
  16. 186
  17. 174
  18. 144
  19. 122
  20. 34
  21. 62
  22. 61
  23. 38
  24. 66
  25. 28
  26. 106
  27. 96
  28. 70
  29. 36
  30. 138
  31. 98
  32. 35
  33. 130
  34. 54
  35. 62
  36. 76
  37. 45
  38. 47
  39. 50
  40. 156

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