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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 805 · 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 144 =
  2. 2.Double 67 =
  3. 3.Double 31 =
  4. 4.Half of 130 =
  5. 5.Half of 32 =
  6. 6.Half of 194 =
  7. 7.Half of 94 =
  8. 8.Double 56 =
  9. 9.Double 46 =
  10. 10.Half of 162 =
  11. 11.Half of 134 =
  12. 12.Half of 44 =
  13. 13.Double 17 =
  14. 14.Double 91 =
  15. 15.Half of 50 =
  16. 16.Double 87 =
  17. 17.Double 94 =
  18. 18.Double 52 =
  19. 19.Half of 68 =
  20. 20.Half of 66 =
  21. 21.Double 57 =
  22. 22.Half of 122 =
  23. 23.Half of 28 =
  24. 24.Half of 170 =
  25. 25.Half of 184 =
  26. 26.Double 88 =
  27. 27.Double 93 =
  28. 28.Half of 120 =
  29. 29.Half of 30 =
  30. 30.Double 51 =
  31. 31.Double 66 =
  32. 32.Double 47 =
  33. 33.Half of 148 =
  34. 34.Double 78 =
  35. 35.Half of 26 =
  36. 36.Half of 72 =
  37. 37.Half of 182 =
  38. 38.Half of 160 =
  39. 39.Double 21 =
  40. 40.Double 74 =

Answer key

  1. 72
  2. 134
  3. 62
  4. 65
  5. 16
  6. 97
  7. 47
  8. 112
  9. 92
  10. 81
  11. 67
  12. 22
  13. 34
  14. 182
  15. 25
  16. 174
  17. 188
  18. 104
  19. 34
  20. 33
  21. 114
  22. 61
  23. 14
  24. 85
  25. 92
  26. 176
  27. 186
  28. 60
  29. 15
  30. 102
  31. 132
  32. 94
  33. 74
  34. 156
  35. 13
  36. 36
  37. 91
  38. 80
  39. 42
  40. 148

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