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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 985 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.38² =
  2. 2.31² =
  3. 3.61² =
  4. 4.88² =
  5. 5.71² =
  6. 6.98² =
  7. 7.51² =
  8. 8.47² =
  9. 9.56² =
  10. 10.48² =
  11. 11.96² =
  12. 12.55² =
  13. 13.84² =
  14. 14.87² =
  15. 15.44² =
  16. 16.36² =
  17. 17.94² =
  18. 18.73² =
  19. 19.41² =
  20. 20.97² =
  21. 21.43² =
  22. 22.89² =
  23. 23.81² =
  24. 24.35² =
  25. 25.52² =
  26. 26.82² =
  27. 27.92² =
  28. 28.69² =
  29. 29.33² =
  30. 30.68² =
  31. 31.65² =
  32. 32.42² =
  33. 33.72² =
  34. 34.93² =
  35. 35.32² =
  36. 36.66² =
  37. 37.63² =
  38. 38.85² =
  39. 39.37² =
  40. 40.99² =

Answer key

  1. 1444
  2. 961
  3. 3721
  4. 7744
  5. 5041
  6. 9604
  7. 2601
  8. 2209
  9. 3136
  10. 2304
  11. 9216
  12. 3025
  13. 7056
  14. 7569
  15. 1936
  16. 1296
  17. 8836
  18. 5329
  19. 1681
  20. 9409
  21. 1849
  22. 7921
  23. 6561
  24. 1225
  25. 2704
  26. 6724
  27. 8464
  28. 4761
  29. 1089
  30. 4624
  31. 4225
  32. 1764
  33. 5184
  34. 8649
  35. 1024
  36. 4356
  37. 3969
  38. 7225
  39. 1369
  40. 9801

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