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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 665 · 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 58 =
  2. 2.Half of 80 =
  3. 3.Half of 152 =
  4. 4.Double 92 =
  5. 5.Double 85 =
  6. 6.Double 24 =
  7. 7.Double 21 =
  8. 8.Half of 32 =
  9. 9.Half of 72 =
  10. 10.Double 91 =
  11. 11.Half of 96 =
  12. 12.Half of 146 =
  13. 13.Half of 142 =
  14. 14.Half of 168 =
  15. 15.Double 93 =
  16. 16.Double 51 =
  17. 17.Double 62 =
  18. 18.Double 31 =
  19. 19.Double 98 =
  20. 20.Double 76 =
  21. 21.Half of 44 =
  22. 22.Double 42 =
  23. 23.Double 82 =
  24. 24.Half of 76 =
  25. 25.Half of 100 =
  26. 26.Double 72 =
  27. 27.Half of 36 =
  28. 28.Double 63 =
  29. 29.Half of 122 =
  30. 30.Double 71 =
  31. 31.Double 87 =
  32. 32.Double 26 =
  33. 33.Double 54 =
  34. 34.Double 52 =
  35. 35.Double 16 =
  36. 36.Half of 126 =
  37. 37.Double 28 =
  38. 38.Double 22 =
  39. 39.Half of 192 =
  40. 40.Double 88 =

Answer key

  1. 116
  2. 40
  3. 76
  4. 184
  5. 170
  6. 48
  7. 42
  8. 16
  9. 36
  10. 182
  11. 48
  12. 73
  13. 71
  14. 84
  15. 186
  16. 102
  17. 124
  18. 62
  19. 196
  20. 152
  21. 22
  22. 84
  23. 164
  24. 38
  25. 50
  26. 144
  27. 18
  28. 126
  29. 61
  30. 142
  31. 174
  32. 52
  33. 108
  34. 104
  35. 32
  36. 63
  37. 56
  38. 44
  39. 96
  40. 176

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