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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 531 · 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. 1.98² =
  2. 2.93² =
  3. 3.51² =
  4. 4.92² =
  5. 5.37² =
  6. 6.61² =
  7. 7.82² =
  8. 8.56² =
  9. 9.69² =
  10. 10.65² =
  11. 11.64² =
  12. 12.78² =
  13. 13.73² =
  14. 14.95² =
  15. 15.72² =
  16. 16.58² =
  17. 17.41² =
  18. 18.74² =
  19. 19.45² =
  20. 20.87² =
  21. 21.49² =
  22. 22.67² =
  23. 23.79² =
  24. 24.76² =
  25. 25.89² =
  26. 26.34² =
  27. 27.83² =
  28. 28.43² =
  29. 29.54² =
  30. 30.44² =
  31. 31.81² =
  32. 32.52² =
  33. 33.59² =
  34. 34.36² =
  35. 35.94² =
  36. 36.88² =
  37. 37.46² =
  38. 38.39² =
  39. 39.71² =
  40. 40.91² =

Answer key

  1. 9604
  2. 8649
  3. 2601
  4. 8464
  5. 1369
  6. 3721
  7. 6724
  8. 3136
  9. 4761
  10. 4225
  11. 4096
  12. 6084
  13. 5329
  14. 9025
  15. 5184
  16. 3364
  17. 1681
  18. 5476
  19. 2025
  20. 7569
  21. 2401
  22. 4489
  23. 6241
  24. 5776
  25. 7921
  26. 1156
  27. 6889
  28. 1849
  29. 2916
  30. 1936
  31. 6561
  32. 2704
  33. 3481
  34. 1296
  35. 8836
  36. 7744
  37. 2116
  38. 1521
  39. 5041
  40. 8281

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