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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 765 · 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. 1.71² =
  2. 2.65² =
  3. 3.35² =
  4. 4.48² =
  5. 5.36² =
  6. 6.46² =
  7. 7.38² =
  8. 8.43² =
  9. 9.79² =
  10. 10.93² =
  11. 11.51² =
  12. 12.59² =
  13. 13.76² =
  14. 14.53² =
  15. 15.77² =
  16. 16.86² =
  17. 17.81² =
  18. 18.97² =
  19. 19.39² =
  20. 20.52² =
  21. 21.68² =
  22. 22.84² =
  23. 23.94² =
  24. 24.73² =
  25. 25.99² =
  26. 26.87² =
  27. 27.41² =
  28. 28.74² =
  29. 29.89² =
  30. 30.32² =
  31. 31.78² =
  32. 32.33² =
  33. 33.55² =
  34. 34.47² =
  35. 35.72² =
  36. 36.49² =
  37. 37.67² =
  38. 38.95² =
  39. 39.31² =
  40. 40.62² =

Answer key

  1. 5041
  2. 4225
  3. 1225
  4. 2304
  5. 1296
  6. 2116
  7. 1444
  8. 1849
  9. 6241
  10. 8649
  11. 2601
  12. 3481
  13. 5776
  14. 2809
  15. 5929
  16. 7396
  17. 6561
  18. 9409
  19. 1521
  20. 2704
  21. 4624
  22. 7056
  23. 8836
  24. 5329
  25. 9801
  26. 7569
  27. 1681
  28. 5476
  29. 7921
  30. 1024
  31. 6084
  32. 1089
  33. 3025
  34. 2209
  35. 5184
  36. 2401
  37. 4489
  38. 9025
  39. 961
  40. 3844

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