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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 616 · 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. 1.53² =
  2. 2.98² =
  3. 3.49² =
  4. 4.71² =
  5. 5.37² =
  6. 6.43² =
  7. 7.35² =
  8. 8.46² =
  9. 9.33² =
  10. 10.58² =
  11. 11.68² =
  12. 12.38² =
  13. 13.51² =
  14. 14.73² =
  15. 15.63² =
  16. 16.82² =
  17. 17.64² =
  18. 18.48² =
  19. 19.96² =
  20. 20.42² =
  21. 21.79² =
  22. 22.69² =
  23. 23.59² =
  24. 24.34² =
  25. 25.91² =
  26. 26.65² =
  27. 27.55² =
  28. 28.31² =
  29. 29.36² =
  30. 30.61² =
  31. 31.94² =
  32. 32.81² =
  33. 33.75² =
  34. 34.92² =
  35. 35.41² =
  36. 36.45² =
  37. 37.86² =
  38. 38.89² =
  39. 39.99² =
  40. 40.95² =

Answer key

  1. 2809
  2. 9604
  3. 2401
  4. 5041
  5. 1369
  6. 1849
  7. 1225
  8. 2116
  9. 1089
  10. 3364
  11. 4624
  12. 1444
  13. 2601
  14. 5329
  15. 3969
  16. 6724
  17. 4096
  18. 2304
  19. 9216
  20. 1764
  21. 6241
  22. 4761
  23. 3481
  24. 1156
  25. 8281
  26. 4225
  27. 3025
  28. 961
  29. 1296
  30. 3721
  31. 8836
  32. 6561
  33. 5625
  34. 8464
  35. 1681
  36. 2025
  37. 7396
  38. 7921
  39. 9801
  40. 9025

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