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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 699 · 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. 1.63² =
  2. 2.95² =
  3. 3.38² =
  4. 4.91² =
  5. 5.76² =
  6. 6.81² =
  7. 7.97² =
  8. 8.57² =
  9. 9.45² =
  10. 10.74² =
  11. 11.41² =
  12. 12.71² =
  13. 13.35² =
  14. 14.59² =
  15. 15.98² =
  16. 16.82² =
  17. 17.75² =
  18. 18.56² =
  19. 19.96² =
  20. 20.42² =
  21. 21.66² =
  22. 22.44² =
  23. 23.36² =
  24. 24.33² =
  25. 25.78² =
  26. 26.37² =
  27. 27.73² =
  28. 28.83² =
  29. 29.52² =
  30. 30.84² =
  31. 31.65² =
  32. 32.89² =
  33. 33.32² =
  34. 34.48² =
  35. 35.46² =
  36. 36.51² =
  37. 37.53² =
  38. 38.47² =
  39. 39.92² =
  40. 40.55² =

Answer key

  1. 3969
  2. 9025
  3. 1444
  4. 8281
  5. 5776
  6. 6561
  7. 9409
  8. 3249
  9. 2025
  10. 5476
  11. 1681
  12. 5041
  13. 1225
  14. 3481
  15. 9604
  16. 6724
  17. 5625
  18. 3136
  19. 9216
  20. 1764
  21. 4356
  22. 1936
  23. 1296
  24. 1089
  25. 6084
  26. 1369
  27. 5329
  28. 6889
  29. 2704
  30. 7056
  31. 4225
  32. 7921
  33. 1024
  34. 2304
  35. 2116
  36. 2601
  37. 2809
  38. 2209
  39. 8464
  40. 3025

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