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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 680 · 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. 1.77² =
  2. 2.91² =
  3. 3.68² =
  4. 4.32² =
  5. 5.39² =
  6. 6.36² =
  7. 7.61² =
  8. 8.38² =
  9. 9.83² =
  10. 10.37² =
  11. 11.44² =
  12. 12.73² =
  13. 13.72² =
  14. 14.92² =
  15. 15.51² =
  16. 16.33² =
  17. 17.66² =
  18. 18.65² =
  19. 19.57² =
  20. 20.79² =
  21. 21.54² =
  22. 22.82² =
  23. 23.71² =
  24. 24.99² =
  25. 25.43² =
  26. 26.95² =
  27. 27.41² =
  28. 28.86² =
  29. 29.85² =
  30. 30.74² =
  31. 31.88² =
  32. 32.49² =
  33. 33.94² =
  34. 34.87² =
  35. 35.31² =
  36. 36.35² =
  37. 37.63² =
  38. 38.78² =
  39. 39.81² =
  40. 40.48² =

Answer key

  1. 5929
  2. 8281
  3. 4624
  4. 1024
  5. 1521
  6. 1296
  7. 3721
  8. 1444
  9. 6889
  10. 1369
  11. 1936
  12. 5329
  13. 5184
  14. 8464
  15. 2601
  16. 1089
  17. 4356
  18. 4225
  19. 3249
  20. 6241
  21. 2916
  22. 6724
  23. 5041
  24. 9801
  25. 1849
  26. 9025
  27. 1681
  28. 7396
  29. 7225
  30. 5476
  31. 7744
  32. 2401
  33. 8836
  34. 7569
  35. 961
  36. 1225
  37. 3969
  38. 6084
  39. 6561
  40. 2304

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