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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 366 · 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. 1.98² =
  2. 2.59² =
  3. 3.38² =
  4. 4.57² =
  5. 5.35² =
  6. 6.36² =
  7. 7.48² =
  8. 8.73² =
  9. 9.83² =
  10. 10.37² =
  11. 11.76² =
  12. 12.41² =
  13. 13.65² =
  14. 14.43² =
  15. 15.97² =
  16. 16.47² =
  17. 17.61² =
  18. 18.79² =
  19. 19.99² =
  20. 20.42² =
  21. 21.33² =
  22. 22.31² =
  23. 23.67² =
  24. 24.96² =
  25. 25.86² =
  26. 26.74² =
  27. 27.75² =
  28. 28.72² =
  29. 29.46² =
  30. 30.71² =
  31. 31.32² =
  32. 32.81² =
  33. 33.45² =
  34. 34.39² =
  35. 35.82² =
  36. 36.68² =
  37. 37.53² =
  38. 38.49² =
  39. 39.51² =
  40. 40.66² =

Answer key

  1. 9604
  2. 3481
  3. 1444
  4. 3249
  5. 1225
  6. 1296
  7. 2304
  8. 5329
  9. 6889
  10. 1369
  11. 5776
  12. 1681
  13. 4225
  14. 1849
  15. 9409
  16. 2209
  17. 3721
  18. 6241
  19. 9801
  20. 1764
  21. 1089
  22. 961
  23. 4489
  24. 9216
  25. 7396
  26. 5476
  27. 5625
  28. 5184
  29. 2116
  30. 5041
  31. 1024
  32. 6561
  33. 2025
  34. 1521
  35. 6724
  36. 4624
  37. 2809
  38. 2401
  39. 2601
  40. 4356

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