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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 312 · 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. 1.65² =
  2. 2.89² =
  3. 3.37² =
  4. 4.41² =
  5. 5.99² =
  6. 6.94² =
  7. 7.47² =
  8. 8.92² =
  9. 9.58² =
  10. 10.85² =
  11. 11.71² =
  12. 12.67² =
  13. 13.31² =
  14. 14.42² =
  15. 15.52² =
  16. 16.98² =
  17. 17.83² =
  18. 18.53² =
  19. 19.68² =
  20. 20.34² =
  21. 21.49² =
  22. 22.39² =
  23. 23.81² =
  24. 24.84² =
  25. 25.61² =
  26. 26.59² =
  27. 27.48² =
  28. 28.57² =
  29. 29.32² =
  30. 30.96² =
  31. 31.51² =
  32. 32.54² =
  33. 33.72² =
  34. 34.93² =
  35. 35.56² =
  36. 36.91² =
  37. 37.79² =
  38. 38.62² =
  39. 39.43² =
  40. 40.95² =

Answer key

  1. 4225
  2. 7921
  3. 1369
  4. 1681
  5. 9801
  6. 8836
  7. 2209
  8. 8464
  9. 3364
  10. 7225
  11. 5041
  12. 4489
  13. 961
  14. 1764
  15. 2704
  16. 9604
  17. 6889
  18. 2809
  19. 4624
  20. 1156
  21. 2401
  22. 1521
  23. 6561
  24. 7056
  25. 3721
  26. 3481
  27. 2304
  28. 3249
  29. 1024
  30. 9216
  31. 2601
  32. 2916
  33. 5184
  34. 8649
  35. 3136
  36. 8281
  37. 6241
  38. 3844
  39. 1849
  40. 9025

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