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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 493 · 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. 1.99² =
  2. 2.49² =
  3. 3.82² =
  4. 4.31² =
  5. 5.37² =
  6. 6.86² =
  7. 7.35² =
  8. 8.72² =
  9. 9.97² =
  10. 10.45² =
  11. 11.93² =
  12. 12.32² =
  13. 13.42² =
  14. 14.36² =
  15. 15.52² =
  16. 16.62² =
  17. 17.89² =
  18. 18.48² =
  19. 19.34² =
  20. 20.88² =
  21. 21.58² =
  22. 22.85² =
  23. 23.61² =
  24. 24.84² =
  25. 25.71² =
  26. 26.47² =
  27. 27.87² =
  28. 28.33² =
  29. 29.91² =
  30. 30.54² =
  31. 31.38² =
  32. 32.44² =
  33. 33.41² =
  34. 34.59² =
  35. 35.75² =
  36. 36.65² =
  37. 37.79² =
  38. 38.53² =
  39. 39.55² =
  40. 40.39² =

Answer key

  1. 9801
  2. 2401
  3. 6724
  4. 961
  5. 1369
  6. 7396
  7. 1225
  8. 5184
  9. 9409
  10. 2025
  11. 8649
  12. 1024
  13. 1764
  14. 1296
  15. 2704
  16. 3844
  17. 7921
  18. 2304
  19. 1156
  20. 7744
  21. 3364
  22. 7225
  23. 3721
  24. 7056
  25. 5041
  26. 2209
  27. 7569
  28. 1089
  29. 8281
  30. 2916
  31. 1444
  32. 1936
  33. 1681
  34. 3481
  35. 5625
  36. 4225
  37. 6241
  38. 2809
  39. 3025
  40. 1521

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