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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 637 · 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 26 =
  2. 2.Double 59 =
  3. 3.Double 38 =
  4. 4.Double 68 =
  5. 5.Double 57 =
  6. 6.Double 19 =
  7. 7.Double 73 =
  8. 8.Half of 180 =
  9. 9.Half of 128 =
  10. 10.Double 94 =
  11. 11.Double 84 =
  12. 12.Double 44 =
  13. 13.Half of 106 =
  14. 14.Double 67 =
  15. 15.Double 76 =
  16. 16.Half of 126 =
  17. 17.Double 16 =
  18. 18.Double 81 =
  19. 19.Half of 44 =
  20. 20.Half of 182 =
  21. 21.Double 62 =
  22. 22.Double 35 =
  23. 23.Double 58 =
  24. 24.Half of 64 =
  25. 25.Half of 34 =
  26. 26.Half of 86 =
  27. 27.Half of 84 =
  28. 28.Half of 192 =
  29. 29.Half of 198 =
  30. 30.Half of 172 =
  31. 31.Double 78 =
  32. 32.Double 29 =
  33. 33.Half of 70 =
  34. 34.Double 24 =
  35. 35.Double 89 =
  36. 36.Double 31 =
  37. 37.Double 18 =
  38. 38.Double 56 =
  39. 39.Double 87 =
  40. 40.Half of 122 =

Answer key

  1. 13
  2. 118
  3. 76
  4. 136
  5. 114
  6. 38
  7. 146
  8. 90
  9. 64
  10. 188
  11. 168
  12. 88
  13. 53
  14. 134
  15. 152
  16. 63
  17. 32
  18. 162
  19. 22
  20. 91
  21. 124
  22. 70
  23. 116
  24. 32
  25. 17
  26. 43
  27. 42
  28. 96
  29. 99
  30. 86
  31. 156
  32. 58
  33. 35
  34. 48
  35. 178
  36. 62
  37. 36
  38. 112
  39. 174
  40. 61

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