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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 838 · 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 62 =
  2. 2.Double 56 =
  3. 3.Double 53 =
  4. 4.Half of 186 =
  5. 5.Double 31 =
  6. 6.Double 57 =
  7. 7.Double 49 =
  8. 8.Double 71 =
  9. 9.Half of 196 =
  10. 10.Half of 194 =
  11. 11.Double 28 =
  12. 12.Double 41 =
  13. 13.Half of 40 =
  14. 14.Half of 104 =
  15. 15.Half of 154 =
  16. 16.Half of 126 =
  17. 17.Half of 34 =
  18. 18.Half of 132 =
  19. 19.Double 21 =
  20. 20.Half of 112 =
  21. 21.Half of 98 =
  22. 22.Double 64 =
  23. 23.Half of 184 =
  24. 24.Half of 72 =
  25. 25.Half of 84 =
  26. 26.Double 67 =
  27. 27.Half of 156 =
  28. 28.Half of 146 =
  29. 29.Double 91 =
  30. 30.Half of 152 =
  31. 31.Double 39 =
  32. 32.Half of 86 =
  33. 33.Half of 188 =
  34. 34.Half of 176 =
  35. 35.Half of 118 =
  36. 36.Half of 88 =
  37. 37.Double 92 =
  38. 38.Half of 148 =
  39. 39.Double 35 =
  40. 40.Double 52 =

Answer key

  1. 124
  2. 112
  3. 106
  4. 93
  5. 62
  6. 114
  7. 98
  8. 142
  9. 98
  10. 97
  11. 56
  12. 82
  13. 20
  14. 52
  15. 77
  16. 63
  17. 17
  18. 66
  19. 42
  20. 56
  21. 49
  22. 128
  23. 92
  24. 36
  25. 42
  26. 134
  27. 78
  28. 73
  29. 182
  30. 76
  31. 78
  32. 43
  33. 94
  34. 88
  35. 59
  36. 44
  37. 184
  38. 74
  39. 70
  40. 104

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