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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 131 · 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. 1.69² =
  2. 2.62² =
  3. 3.77² =
  4. 4.63² =
  5. 5.35² =
  6. 6.33² =
  7. 7.41² =
  8. 8.96² =
  9. 9.61² =
  10. 10.71² =
  11. 11.75² =
  12. 12.83² =
  13. 13.44² =
  14. 14.72² =
  15. 15.52² =
  16. 16.53² =
  17. 17.65² =
  18. 18.91² =
  19. 19.57² =
  20. 20.95² =
  21. 21.43² =
  22. 22.67² =
  23. 23.85² =
  24. 24.73² =
  25. 25.88² =
  26. 26.39² =
  27. 27.51² =
  28. 28.38² =
  29. 29.79² =
  30. 30.59² =
  31. 31.94² =
  32. 32.58² =
  33. 33.81² =
  34. 34.66² =
  35. 35.93² =
  36. 36.99² =
  37. 37.45² =
  38. 38.46² =
  39. 39.48² =
  40. 40.89² =

Answer key

  1. 4761
  2. 3844
  3. 5929
  4. 3969
  5. 1225
  6. 1089
  7. 1681
  8. 9216
  9. 3721
  10. 5041
  11. 5625
  12. 6889
  13. 1936
  14. 5184
  15. 2704
  16. 2809
  17. 4225
  18. 8281
  19. 3249
  20. 9025
  21. 1849
  22. 4489
  23. 7225
  24. 5329
  25. 7744
  26. 1521
  27. 2601
  28. 1444
  29. 6241
  30. 3481
  31. 8836
  32. 3364
  33. 6561
  34. 4356
  35. 8649
  36. 9801
  37. 2025
  38. 2116
  39. 2304
  40. 7921

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