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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 779 · 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. 1.65² =
  2. 2.95² =
  3. 3.91² =
  4. 4.35² =
  5. 5.39² =
  6. 6.93² =
  7. 7.53² =
  8. 8.66² =
  9. 9.96² =
  10. 10.41² =
  11. 11.67² =
  12. 12.55² =
  13. 13.44² =
  14. 14.51² =
  15. 15.49² =
  16. 16.62² =
  17. 17.37² =
  18. 18.71² =
  19. 19.86² =
  20. 20.81² =
  21. 21.68² =
  22. 22.64² =
  23. 23.87² =
  24. 24.76² =
  25. 25.38² =
  26. 26.75² =
  27. 27.61² =
  28. 28.78² =
  29. 29.82² =
  30. 30.84² =
  31. 31.89² =
  32. 32.88² =
  33. 33.59² =
  34. 34.45² =
  35. 35.63² =
  36. 36.47² =
  37. 37.92² =
  38. 38.97² =
  39. 39.46² =
  40. 40.77² =

Answer key

  1. 4225
  2. 9025
  3. 8281
  4. 1225
  5. 1521
  6. 8649
  7. 2809
  8. 4356
  9. 9216
  10. 1681
  11. 4489
  12. 3025
  13. 1936
  14. 2601
  15. 2401
  16. 3844
  17. 1369
  18. 5041
  19. 7396
  20. 6561
  21. 4624
  22. 4096
  23. 7569
  24. 5776
  25. 1444
  26. 5625
  27. 3721
  28. 6084
  29. 6724
  30. 7056
  31. 7921
  32. 7744
  33. 3481
  34. 2025
  35. 3969
  36. 2209
  37. 8464
  38. 9409
  39. 2116
  40. 5929

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