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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 319 · 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. 1.84² =
  2. 2.37² =
  3. 3.55² =
  4. 4.61² =
  5. 5.41² =
  6. 6.46² =
  7. 7.35² =
  8. 8.52² =
  9. 9.58² =
  10. 10.78² =
  11. 11.44² =
  12. 12.91² =
  13. 13.53² =
  14. 14.57² =
  15. 15.81² =
  16. 16.85² =
  17. 17.43² =
  18. 18.98² =
  19. 19.45² =
  20. 20.75² =
  21. 21.33² =
  22. 22.87² =
  23. 23.49² =
  24. 24.95² =
  25. 25.79² =
  26. 26.63² =
  27. 27.67² =
  28. 28.71² =
  29. 29.83² =
  30. 30.64² =
  31. 31.31² =
  32. 32.96² =
  33. 33.39² =
  34. 34.65² =
  35. 35.88² =
  36. 36.68² =
  37. 37.54² =
  38. 38.77² =
  39. 39.86² =
  40. 40.82² =

Answer key

  1. 7056
  2. 1369
  3. 3025
  4. 3721
  5. 1681
  6. 2116
  7. 1225
  8. 2704
  9. 3364
  10. 6084
  11. 1936
  12. 8281
  13. 2809
  14. 3249
  15. 6561
  16. 7225
  17. 1849
  18. 9604
  19. 2025
  20. 5625
  21. 1089
  22. 7569
  23. 2401
  24. 9025
  25. 6241
  26. 3969
  27. 4489
  28. 5041
  29. 6889
  30. 4096
  31. 961
  32. 9216
  33. 1521
  34. 4225
  35. 7744
  36. 4624
  37. 2916
  38. 5929
  39. 7396
  40. 6724

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