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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 835 · 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. 1.49² =
  2. 2.72² =
  3. 3.65² =
  4. 4.53² =
  5. 5.48² =
  6. 6.62² =
  7. 7.47² =
  8. 8.57² =
  9. 9.89² =
  10. 10.94² =
  11. 11.88² =
  12. 12.38² =
  13. 13.36² =
  14. 14.71² =
  15. 15.51² =
  16. 16.52² =
  17. 17.42² =
  18. 18.31² =
  19. 19.61² =
  20. 20.87² =
  21. 21.44² =
  22. 22.74² =
  23. 23.93² =
  24. 24.66² =
  25. 25.64² =
  26. 26.34² =
  27. 27.39² =
  28. 28.96² =
  29. 29.37² =
  30. 30.73² =
  31. 31.86² =
  32. 32.69² =
  33. 33.58² =
  34. 34.99² =
  35. 35.81² =
  36. 36.68² =
  37. 37.79² =
  38. 38.35² =
  39. 39.97² =
  40. 40.33² =

Answer key

  1. 2401
  2. 5184
  3. 4225
  4. 2809
  5. 2304
  6. 3844
  7. 2209
  8. 3249
  9. 7921
  10. 8836
  11. 7744
  12. 1444
  13. 1296
  14. 5041
  15. 2601
  16. 2704
  17. 1764
  18. 961
  19. 3721
  20. 7569
  21. 1936
  22. 5476
  23. 8649
  24. 4356
  25. 4096
  26. 1156
  27. 1521
  28. 9216
  29. 1369
  30. 5329
  31. 7396
  32. 4761
  33. 3364
  34. 9801
  35. 6561
  36. 4624
  37. 6241
  38. 1225
  39. 9409
  40. 1089

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