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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 511 · 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 89 =
  2. 2.Half of 144 =
  3. 3.Double 33 =
  4. 4.Double 96 =
  5. 5.Half of 100 =
  6. 6.Double 86 =
  7. 7.Half of 182 =
  8. 8.Double 69 =
  9. 9.Double 76 =
  10. 10.Double 88 =
  11. 11.Double 73 =
  12. 12.Half of 68 =
  13. 13.Half of 156 =
  14. 14.Half of 50 =
  15. 15.Double 68 =
  16. 16.Half of 40 =
  17. 17.Double 37 =
  18. 18.Double 27 =
  19. 19.Double 52 =
  20. 20.Half of 72 =
  21. 21.Double 56 =
  22. 22.Half of 180 =
  23. 23.Half of 108 =
  24. 24.Double 63 =
  25. 25.Half of 64 =
  26. 26.Half of 196 =
  27. 27.Double 98 =
  28. 28.Half of 48 =
  29. 29.Half of 132 =
  30. 30.Double 55 =
  31. 31.Double 59 =
  32. 32.Double 26 =
  33. 33.Double 31 =
  34. 34.Double 25 =
  35. 35.Double 61 =
  36. 36.Double 94 =
  37. 37.Double 32 =
  38. 38.Half of 188 =
  39. 39.Double 35 =
  40. 40.Double 82 =

Answer key

  1. 178
  2. 72
  3. 66
  4. 192
  5. 50
  6. 172
  7. 91
  8. 138
  9. 152
  10. 176
  11. 146
  12. 34
  13. 78
  14. 25
  15. 136
  16. 20
  17. 74
  18. 54
  19. 104
  20. 36
  21. 112
  22. 90
  23. 54
  24. 126
  25. 32
  26. 98
  27. 196
  28. 24
  29. 66
  30. 110
  31. 118
  32. 52
  33. 62
  34. 50
  35. 122
  36. 188
  37. 64
  38. 94
  39. 70
  40. 164

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