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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 477 · 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. 1.61² =
  2. 2.43² =
  3. 3.84² =
  4. 4.89² =
  5. 5.97² =
  6. 6.83² =
  7. 7.52² =
  8. 8.39² =
  9. 9.46² =
  10. 10.71² =
  11. 11.44² =
  12. 12.79² =
  13. 13.41² =
  14. 14.98² =
  15. 15.65² =
  16. 16.56² =
  17. 17.87² =
  18. 18.94² =
  19. 19.59² =
  20. 20.48² =
  21. 21.33² =
  22. 22.68² =
  23. 23.31² =
  24. 24.85² =
  25. 25.32² =
  26. 26.81² =
  27. 27.72² =
  28. 28.45² =
  29. 29.36² =
  30. 30.63² =
  31. 31.57² =
  32. 32.55² =
  33. 33.77² =
  34. 34.73² =
  35. 35.37² =
  36. 36.67² =
  37. 37.78² =
  38. 38.86² =
  39. 39.74² =
  40. 40.91² =

Answer key

  1. 3721
  2. 1849
  3. 7056
  4. 7921
  5. 9409
  6. 6889
  7. 2704
  8. 1521
  9. 2116
  10. 5041
  11. 1936
  12. 6241
  13. 1681
  14. 9604
  15. 4225
  16. 3136
  17. 7569
  18. 8836
  19. 3481
  20. 2304
  21. 1089
  22. 4624
  23. 961
  24. 7225
  25. 1024
  26. 6561
  27. 5184
  28. 2025
  29. 1296
  30. 3969
  31. 3249
  32. 3025
  33. 5929
  34. 5329
  35. 1369
  36. 4489
  37. 6084
  38. 7396
  39. 5476
  40. 8281

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