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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 428 · 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. 1.71² =
  2. 2.87² =
  3. 3.75² =
  4. 4.76² =
  5. 5.51² =
  6. 6.54² =
  7. 7.96² =
  8. 8.47² =
  9. 9.81² =
  10. 10.39² =
  11. 11.45² =
  12. 12.82² =
  13. 13.72² =
  14. 14.55² =
  15. 15.79² =
  16. 16.36² =
  17. 17.78² =
  18. 18.53² =
  19. 19.63² =
  20. 20.95² =
  21. 21.67² =
  22. 22.46² =
  23. 23.84² =
  24. 24.65² =
  25. 25.62² =
  26. 26.97² =
  27. 27.64² =
  28. 28.73² =
  29. 29.57² =
  30. 30.41² =
  31. 31.48² =
  32. 32.94² =
  33. 33.38² =
  34. 34.49² =
  35. 35.77² =
  36. 36.42² =
  37. 37.31² =
  38. 38.74² =
  39. 39.99² =
  40. 40.66² =

Answer key

  1. 5041
  2. 7569
  3. 5625
  4. 5776
  5. 2601
  6. 2916
  7. 9216
  8. 2209
  9. 6561
  10. 1521
  11. 2025
  12. 6724
  13. 5184
  14. 3025
  15. 6241
  16. 1296
  17. 6084
  18. 2809
  19. 3969
  20. 9025
  21. 4489
  22. 2116
  23. 7056
  24. 4225
  25. 3844
  26. 9409
  27. 4096
  28. 5329
  29. 3249
  30. 1681
  31. 2304
  32. 8836
  33. 1444
  34. 2401
  35. 5929
  36. 1764
  37. 961
  38. 5476
  39. 9801
  40. 4356

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