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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 289 · 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 97 =
  2. 2.Double 56 =
  3. 3.Half of 144 =
  4. 4.Double 35 =
  5. 5.Half of 86 =
  6. 6.Double 51 =
  7. 7.Double 96 =
  8. 8.Double 92 =
  9. 9.Double 53 =
  10. 10.Double 74 =
  11. 11.Half of 36 =
  12. 12.Half of 150 =
  13. 13.Half of 88 =
  14. 14.Half of 192 =
  15. 15.Double 95 =
  16. 16.Double 34 =
  17. 17.Half of 130 =
  18. 18.Double 65 =
  19. 19.Double 58 =
  20. 20.Double 21 =
  21. 21.Double 31 =
  22. 22.Double 83 =
  23. 23.Double 61 =
  24. 24.Double 43 =
  25. 25.Double 24 =
  26. 26.Half of 40 =
  27. 27.Half of 94 =
  28. 28.Double 86 =
  29. 29.Half of 54 =
  30. 30.Double 37 =
  31. 31.Half of 122 =
  32. 32.Half of 148 =
  33. 33.Half of 112 =
  34. 34.Double 16 =
  35. 35.Half of 104 =
  36. 36.Double 84 =
  37. 37.Half of 110 =
  38. 38.Double 72 =
  39. 39.Half of 38 =
  40. 40.Half of 56 =

Answer key

  1. 194
  2. 112
  3. 72
  4. 70
  5. 43
  6. 102
  7. 192
  8. 184
  9. 106
  10. 148
  11. 18
  12. 75
  13. 44
  14. 96
  15. 190
  16. 68
  17. 65
  18. 130
  19. 116
  20. 42
  21. 62
  22. 166
  23. 122
  24. 86
  25. 48
  26. 20
  27. 47
  28. 172
  29. 27
  30. 74
  31. 61
  32. 74
  33. 56
  34. 32
  35. 52
  36. 168
  37. 55
  38. 144
  39. 19
  40. 28

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