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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 924 · 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 92 =
  2. 2.Double 67 =
  3. 3.Half of 68 =
  4. 4.Half of 164 =
  5. 5.Double 94 =
  6. 6.Double 54 =
  7. 7.Double 73 =
  8. 8.Half of 58 =
  9. 9.Double 24 =
  10. 10.Double 39 =
  11. 11.Double 91 =
  12. 12.Double 61 =
  13. 13.Double 49 =
  14. 14.Half of 76 =
  15. 15.Half of 158 =
  16. 16.Double 53 =
  17. 17.Double 86 =
  18. 18.Half of 186 =
  19. 19.Double 65 =
  20. 20.Double 38 =
  21. 21.Double 23 =
  22. 22.Double 99 =
  23. 23.Half of 104 =
  24. 24.Double 41 =
  25. 25.Half of 60 =
  26. 26.Half of 62 =
  27. 27.Half of 102 =
  28. 28.Half of 86 =
  29. 29.Double 98 =
  30. 30.Half of 148 =
  31. 31.Half of 190 =
  32. 32.Half of 182 =
  33. 33.Double 56 =
  34. 34.Double 76 =
  35. 35.Double 74 =
  36. 36.Double 37 =
  37. 37.Double 19 =
  38. 38.Double 87 =
  39. 39.Double 48 =
  40. 40.Half of 64 =

Answer key

  1. 46
  2. 134
  3. 34
  4. 82
  5. 188
  6. 108
  7. 146
  8. 29
  9. 48
  10. 78
  11. 182
  12. 122
  13. 98
  14. 38
  15. 79
  16. 106
  17. 172
  18. 93
  19. 130
  20. 76
  21. 46
  22. 198
  23. 52
  24. 82
  25. 30
  26. 31
  27. 51
  28. 43
  29. 196
  30. 74
  31. 95
  32. 91
  33. 112
  34. 152
  35. 148
  36. 74
  37. 38
  38. 174
  39. 96
  40. 32

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