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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 200 · 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 78 =
  2. 2.Double 36 =
  3. 3.Half of 152 =
  4. 4.Half of 68 =
  5. 5.Half of 110 =
  6. 6.Double 91 =
  7. 7.Half of 188 =
  8. 8.Half of 170 =
  9. 9.Half of 88 =
  10. 10.Half of 76 =
  11. 11.Double 86 =
  12. 12.Half of 160 =
  13. 13.Half of 86 =
  14. 14.Double 61 =
  15. 15.Half of 198 =
  16. 16.Half of 52 =
  17. 17.Half of 46 =
  18. 18.Double 41 =
  19. 19.Double 52 =
  20. 20.Half of 60 =
  21. 21.Double 84 =
  22. 22.Half of 90 =
  23. 23.Half of 114 =
  24. 24.Double 58 =
  25. 25.Double 17 =
  26. 26.Half of 136 =
  27. 27.Half of 104 =
  28. 28.Double 23 =
  29. 29.Double 76 =
  30. 30.Half of 182 =
  31. 31.Double 26 =
  32. 32.Double 16 =
  33. 33.Double 75 =
  34. 34.Double 24 =
  35. 35.Double 79 =
  36. 36.Half of 100 =
  37. 37.Half of 44 =
  38. 38.Half of 32 =
  39. 39.Half of 138 =
  40. 40.Double 74 =

Answer key

  1. 156
  2. 72
  3. 76
  4. 34
  5. 55
  6. 182
  7. 94
  8. 85
  9. 44
  10. 38
  11. 172
  12. 80
  13. 43
  14. 122
  15. 99
  16. 26
  17. 23
  18. 82
  19. 104
  20. 30
  21. 168
  22. 45
  23. 57
  24. 116
  25. 34
  26. 68
  27. 52
  28. 46
  29. 152
  30. 91
  31. 52
  32. 32
  33. 150
  34. 48
  35. 158
  36. 50
  37. 22
  38. 16
  39. 69
  40. 148

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