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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 129 · 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. 1.86² =
  2. 2.58² =
  3. 3.33² =
  4. 4.43² =
  5. 5.35² =
  6. 6.42² =
  7. 7.61² =
  8. 8.83² =
  9. 9.54² =
  10. 10.64² =
  11. 11.51² =
  12. 12.99² =
  13. 13.92² =
  14. 14.52² =
  15. 15.82² =
  16. 16.77² =
  17. 17.39² =
  18. 18.59² =
  19. 19.73² =
  20. 20.89² =
  21. 21.88² =
  22. 22.57² =
  23. 23.41² =
  24. 24.76² =
  25. 25.72² =
  26. 26.48² =
  27. 27.67² =
  28. 28.37² =
  29. 29.66² =
  30. 30.34² =
  31. 31.46² =
  32. 32.63² =
  33. 33.38² =
  34. 34.45² =
  35. 35.75² =
  36. 36.65² =
  37. 37.68² =
  38. 38.85² =
  39. 39.78² =
  40. 40.47² =

Answer key

  1. 7396
  2. 3364
  3. 1089
  4. 1849
  5. 1225
  6. 1764
  7. 3721
  8. 6889
  9. 2916
  10. 4096
  11. 2601
  12. 9801
  13. 8464
  14. 2704
  15. 6724
  16. 5929
  17. 1521
  18. 3481
  19. 5329
  20. 7921
  21. 7744
  22. 3249
  23. 1681
  24. 5776
  25. 5184
  26. 2304
  27. 4489
  28. 1369
  29. 4356
  30. 1156
  31. 2116
  32. 3969
  33. 1444
  34. 2025
  35. 5625
  36. 4225
  37. 4624
  38. 7225
  39. 6084
  40. 2209

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