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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 94 · 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 72 =
  2. 2.Half of 96 =
  3. 3.Double 21 =
  4. 4.Double 94 =
  5. 5.Double 44 =
  6. 6.Double 43 =
  7. 7.Double 31 =
  8. 8.Half of 34 =
  9. 9.Half of 58 =
  10. 10.Half of 150 =
  11. 11.Double 53 =
  12. 12.Double 32 =
  13. 13.Double 77 =
  14. 14.Half of 56 =
  15. 15.Double 29 =
  16. 16.Half of 52 =
  17. 17.Double 26 =
  18. 18.Half of 110 =
  19. 19.Double 24 =
  20. 20.Double 73 =
  21. 21.Half of 186 =
  22. 22.Half of 134 =
  23. 23.Double 96 =
  24. 24.Double 74 =
  25. 25.Double 89 =
  26. 26.Double 69 =
  27. 27.Half of 70 =
  28. 28.Double 98 =
  29. 29.Double 88 =
  30. 30.Half of 184 =
  31. 31.Double 33 =
  32. 32.Half of 128 =
  33. 33.Double 85 =
  34. 34.Half of 140 =
  35. 35.Double 38 =
  36. 36.Double 48 =
  37. 37.Double 41 =
  38. 38.Double 36 =
  39. 39.Half of 122 =
  40. 40.Double 66 =

Answer key

  1. 36
  2. 48
  3. 42
  4. 188
  5. 88
  6. 86
  7. 62
  8. 17
  9. 29
  10. 75
  11. 106
  12. 64
  13. 154
  14. 28
  15. 58
  16. 26
  17. 52
  18. 55
  19. 48
  20. 146
  21. 93
  22. 67
  23. 192
  24. 148
  25. 178
  26. 138
  27. 35
  28. 196
  29. 176
  30. 92
  31. 66
  32. 64
  33. 170
  34. 70
  35. 76
  36. 96
  37. 82
  38. 72
  39. 61
  40. 132

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