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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 11 · 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. 1.81² =
  2. 2.65² =
  3. 3.79² =
  4. 4.51² =
  5. 5.92² =
  6. 6.37² =
  7. 7.33² =
  8. 8.57² =
  9. 9.63² =
  10. 10.67² =
  11. 11.41² =
  12. 12.56² =
  13. 13.59² =
  14. 14.42² =
  15. 15.72² =
  16. 16.47² =
  17. 17.38² =
  18. 18.55² =
  19. 19.69² =
  20. 20.43² =
  21. 21.94² =
  22. 22.39² =
  23. 23.91² =
  24. 24.71² =
  25. 25.52² =
  26. 26.77² =
  27. 27.74² =
  28. 28.99² =
  29. 29.44² =
  30. 30.45² =
  31. 31.34² =
  32. 32.64² =
  33. 33.54² =
  34. 34.53² =
  35. 35.61² =
  36. 36.78² =
  37. 37.76² =
  38. 38.95² =
  39. 39.58² =
  40. 40.32² =

Answer key

  1. 6561
  2. 4225
  3. 6241
  4. 2601
  5. 8464
  6. 1369
  7. 1089
  8. 3249
  9. 3969
  10. 4489
  11. 1681
  12. 3136
  13. 3481
  14. 1764
  15. 5184
  16. 2209
  17. 1444
  18. 3025
  19. 4761
  20. 1849
  21. 8836
  22. 1521
  23. 8281
  24. 5041
  25. 2704
  26. 5929
  27. 5476
  28. 9801
  29. 1936
  30. 2025
  31. 1156
  32. 4096
  33. 2916
  34. 2809
  35. 3721
  36. 6084
  37. 5776
  38. 9025
  39. 3364
  40. 1024

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