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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 676 · 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 74 =
  2. 2.Half of 154 =
  3. 3.Double 98 =
  4. 4.Half of 106 =
  5. 5.Half of 38 =
  6. 6.Half of 182 =
  7. 7.Double 65 =
  8. 8.Half of 74 =
  9. 9.Double 49 =
  10. 10.Double 55 =
  11. 11.Half of 86 =
  12. 12.Double 52 =
  13. 13.Half of 68 =
  14. 14.Double 41 =
  15. 15.Half of 162 =
  16. 16.Double 77 =
  17. 17.Double 16 =
  18. 18.Half of 80 =
  19. 19.Half of 98 =
  20. 20.Double 43 =
  21. 21.Double 53 =
  22. 22.Half of 50 =
  23. 23.Half of 136 =
  24. 24.Double 38 =
  25. 25.Half of 30 =
  26. 26.Half of 28 =
  27. 27.Double 29 =
  28. 28.Half of 124 =
  29. 29.Double 75 =
  30. 30.Half of 138 =
  31. 31.Half of 116 =
  32. 32.Double 31 =
  33. 33.Double 48 =
  34. 34.Half of 126 =
  35. 35.Double 64 =
  36. 36.Double 18 =
  37. 37.Double 23 =
  38. 38.Double 91 =
  39. 39.Double 44 =
  40. 40.Double 66 =

Answer key

  1. 148
  2. 77
  3. 196
  4. 53
  5. 19
  6. 91
  7. 130
  8. 37
  9. 98
  10. 110
  11. 43
  12. 104
  13. 34
  14. 82
  15. 81
  16. 154
  17. 32
  18. 40
  19. 49
  20. 86
  21. 106
  22. 25
  23. 68
  24. 76
  25. 15
  26. 14
  27. 58
  28. 62
  29. 150
  30. 69
  31. 58
  32. 62
  33. 96
  34. 63
  35. 128
  36. 36
  37. 46
  38. 182
  39. 88
  40. 132

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