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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 27 · 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. 1.76² =
  2. 2.41² =
  3. 3.68² =
  4. 4.95² =
  5. 5.39² =
  6. 6.34² =
  7. 7.89² =
  8. 8.79² =
  9. 9.77² =
  10. 10.55² =
  11. 11.71² =
  12. 12.33² =
  13. 13.53² =
  14. 14.61² =
  15. 15.36² =
  16. 16.63² =
  17. 17.56² =
  18. 18.35² =
  19. 19.46² =
  20. 20.42² =
  21. 21.44² =
  22. 22.83² =
  23. 23.47² =
  24. 24.81² =
  25. 25.69² =
  26. 26.51² =
  27. 27.96² =
  28. 28.67² =
  29. 29.57² =
  30. 30.87² =
  31. 31.99² =
  32. 32.98² =
  33. 33.75² =
  34. 34.59² =
  35. 35.78² =
  36. 36.85² =
  37. 37.38² =
  38. 38.54² =
  39. 39.66² =
  40. 40.65² =

Answer key

  1. 5776
  2. 1681
  3. 4624
  4. 9025
  5. 1521
  6. 1156
  7. 7921
  8. 6241
  9. 5929
  10. 3025
  11. 5041
  12. 1089
  13. 2809
  14. 3721
  15. 1296
  16. 3969
  17. 3136
  18. 1225
  19. 2116
  20. 1764
  21. 1936
  22. 6889
  23. 2209
  24. 6561
  25. 4761
  26. 2601
  27. 9216
  28. 4489
  29. 3249
  30. 7569
  31. 9801
  32. 9604
  33. 5625
  34. 3481
  35. 6084
  36. 7225
  37. 1444
  38. 2916
  39. 4356
  40. 4225

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