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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 445 · 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 32 =
  2. 2.Double 29 =
  3. 3.Double 72 =
  4. 4.Double 89 =
  5. 5.Half of 38 =
  6. 6.Half of 104 =
  7. 7.Half of 44 =
  8. 8.Half of 190 =
  9. 9.Double 64 =
  10. 10.Double 99 =
  11. 11.Double 63 =
  12. 12.Double 39 =
  13. 13.Half of 82 =
  14. 14.Half of 132 =
  15. 15.Double 43 =
  16. 16.Double 34 =
  17. 17.Double 67 =
  18. 18.Double 61 =
  19. 19.Double 66 =
  20. 20.Half of 36 =
  21. 21.Double 96 =
  22. 22.Half of 126 =
  23. 23.Half of 138 =
  24. 24.Double 44 =
  25. 25.Half of 194 =
  26. 26.Half of 42 =
  27. 27.Half of 116 =
  28. 28.Half of 154 =
  29. 29.Double 51 =
  30. 30.Double 49 =
  31. 31.Half of 112 =
  32. 32.Double 18 =
  33. 33.Half of 142 =
  34. 34.Double 33 =
  35. 35.Double 31 =
  36. 36.Half of 148 =
  37. 37.Double 38 =
  38. 38.Half of 74 =
  39. 39.Double 56 =
  40. 40.Double 27 =

Answer key

  1. 64
  2. 58
  3. 144
  4. 178
  5. 19
  6. 52
  7. 22
  8. 95
  9. 128
  10. 198
  11. 126
  12. 78
  13. 41
  14. 66
  15. 86
  16. 68
  17. 134
  18. 122
  19. 132
  20. 18
  21. 192
  22. 63
  23. 69
  24. 88
  25. 97
  26. 21
  27. 58
  28. 77
  29. 102
  30. 98
  31. 56
  32. 36
  33. 71
  34. 66
  35. 62
  36. 74
  37. 76
  38. 37
  39. 112
  40. 54

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