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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 239 · 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. 2.61² =
  3. 3.67² =
  4. 4.95² =
  5. 5.77² =
  6. 6.53² =
  7. 7.81² =
  8. 8.58² =
  9. 9.37² =
  10. 10.91² =
  11. 11.69² =
  12. 12.52² =
  13. 13.66² =
  14. 14.94² =
  15. 15.44² =
  16. 16.51² =
  17. 17.32² =
  18. 18.84² =
  19. 19.47² =
  20. 20.71² =
  21. 21.59² =
  22. 22.92² =
  23. 23.42² =
  24. 24.36² =
  25. 25.65² =
  26. 26.43² =
  27. 27.62² =
  28. 28.88² =
  29. 29.78² =
  30. 30.41² =
  31. 31.76² =
  32. 32.74² =
  33. 33.79² =
  34. 34.38² =
  35. 35.82² =
  36. 36.83² =
  37. 37.89² =
  38. 38.49² =
  39. 39.99² =
  40. 40.35² =

Answer key

  1. 7396
  2. 3721
  3. 4489
  4. 9025
  5. 5929
  6. 2809
  7. 6561
  8. 3364
  9. 1369
  10. 8281
  11. 4761
  12. 2704
  13. 4356
  14. 8836
  15. 1936
  16. 2601
  17. 1024
  18. 7056
  19. 2209
  20. 5041
  21. 3481
  22. 8464
  23. 1764
  24. 1296
  25. 4225
  26. 1849
  27. 3844
  28. 7744
  29. 6084
  30. 1681
  31. 5776
  32. 5476
  33. 6241
  34. 1444
  35. 6724
  36. 6889
  37. 7921
  38. 2401
  39. 9801
  40. 1225

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