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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 77 · 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. 1.53² =
  2. 2.82² =
  3. 3.41² =
  4. 4.52² =
  5. 5.96² =
  6. 6.42² =
  7. 7.62² =
  8. 8.48² =
  9. 9.46² =
  10. 10.51² =
  11. 11.37² =
  12. 12.72² =
  13. 13.91² =
  14. 14.92² =
  15. 15.79² =
  16. 16.34² =
  17. 17.71² =
  18. 18.47² =
  19. 19.73² =
  20. 20.97² =
  21. 21.78² =
  22. 22.59² =
  23. 23.95² =
  24. 24.32² =
  25. 25.58² =
  26. 26.43² =
  27. 27.36² =
  28. 28.33² =
  29. 29.81² =
  30. 30.86² =
  31. 31.94² =
  32. 32.45² =
  33. 33.67² =
  34. 34.65² =
  35. 35.44² =
  36. 36.31² =
  37. 37.75² =
  38. 38.49² =
  39. 39.39² =
  40. 40.87² =

Answer key

  1. 2809
  2. 6724
  3. 1681
  4. 2704
  5. 9216
  6. 1764
  7. 3844
  8. 2304
  9. 2116
  10. 2601
  11. 1369
  12. 5184
  13. 8281
  14. 8464
  15. 6241
  16. 1156
  17. 5041
  18. 2209
  19. 5329
  20. 9409
  21. 6084
  22. 3481
  23. 9025
  24. 1024
  25. 3364
  26. 1849
  27. 1296
  28. 1089
  29. 6561
  30. 7396
  31. 8836
  32. 2025
  33. 4489
  34. 4225
  35. 1936
  36. 961
  37. 5625
  38. 2401
  39. 1521
  40. 7569

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