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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 761 · 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 44 =
  2. 2.Double 27 =
  3. 3.Double 53 =
  4. 4.Half of 164 =
  5. 5.Double 16 =
  6. 6.Half of 30 =
  7. 7.Double 18 =
  8. 8.Double 19 =
  9. 9.Double 63 =
  10. 10.Half of 102 =
  11. 11.Double 62 =
  12. 12.Half of 78 =
  13. 13.Double 31 =
  14. 14.Half of 100 =
  15. 15.Half of 122 =
  16. 16.Double 21 =
  17. 17.Half of 48 =
  18. 18.Half of 94 =
  19. 19.Half of 66 =
  20. 20.Double 98 =
  21. 21.Double 49 =
  22. 22.Double 51 =
  23. 23.Double 65 =
  24. 24.Half of 170 =
  25. 25.Double 43 =
  26. 26.Double 86 =
  27. 27.Double 52 =
  28. 28.Double 97 =
  29. 29.Half of 166 =
  30. 30.Half of 40 =
  31. 31.Half of 190 =
  32. 32.Half of 104 =
  33. 33.Half of 146 =
  34. 34.Double 57 =
  35. 35.Double 72 =
  36. 36.Double 94 =
  37. 37.Double 54 =
  38. 38.Double 68 =
  39. 39.Double 91 =
  40. 40.Half of 28 =

Answer key

  1. 22
  2. 54
  3. 106
  4. 82
  5. 32
  6. 15
  7. 36
  8. 38
  9. 126
  10. 51
  11. 124
  12. 39
  13. 62
  14. 50
  15. 61
  16. 42
  17. 24
  18. 47
  19. 33
  20. 196
  21. 98
  22. 102
  23. 130
  24. 85
  25. 86
  26. 172
  27. 104
  28. 194
  29. 83
  30. 20
  31. 95
  32. 52
  33. 73
  34. 114
  35. 144
  36. 188
  37. 108
  38. 136
  39. 182
  40. 14

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