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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 209 · 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. 1.51² =
  2. 2.62² =
  3. 3.92² =
  4. 4.76² =
  5. 5.87² =
  6. 6.41² =
  7. 7.53² =
  8. 8.99² =
  9. 9.71² =
  10. 10.79² =
  11. 11.91² =
  12. 12.61² =
  13. 13.33² =
  14. 14.67² =
  15. 15.48² =
  16. 16.58² =
  17. 17.36² =
  18. 18.57² =
  19. 19.75² =
  20. 20.83² =
  21. 21.31² =
  22. 22.64² =
  23. 23.46² =
  24. 24.59² =
  25. 25.88² =
  26. 26.85² =
  27. 27.66² =
  28. 28.65² =
  29. 29.32² =
  30. 30.44² =
  31. 31.81² =
  32. 32.55² =
  33. 33.68² =
  34. 34.49² =
  35. 35.69² =
  36. 36.95² =
  37. 37.73² =
  38. 38.78² =
  39. 39.84² =
  40. 40.74² =

Answer key

  1. 2601
  2. 3844
  3. 8464
  4. 5776
  5. 7569
  6. 1681
  7. 2809
  8. 9801
  9. 5041
  10. 6241
  11. 8281
  12. 3721
  13. 1089
  14. 4489
  15. 2304
  16. 3364
  17. 1296
  18. 3249
  19. 5625
  20. 6889
  21. 961
  22. 4096
  23. 2116
  24. 3481
  25. 7744
  26. 7225
  27. 4356
  28. 4225
  29. 1024
  30. 1936
  31. 6561
  32. 3025
  33. 4624
  34. 2401
  35. 4761
  36. 9025
  37. 5329
  38. 6084
  39. 7056
  40. 5476

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