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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 272 · 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. 1.55² =
  2. 2.54² =
  3. 3.97² =
  4. 4.96² =
  5. 5.94² =
  6. 6.89² =
  7. 7.91² =
  8. 8.74² =
  9. 9.47² =
  10. 10.46² =
  11. 11.78² =
  12. 12.48² =
  13. 13.41² =
  14. 14.79² =
  15. 15.68² =
  16. 16.81² =
  17. 17.49² =
  18. 18.58² =
  19. 19.69² =
  20. 20.42² =
  21. 21.65² =
  22. 22.33² =
  23. 23.57² =
  24. 24.37² =
  25. 25.98² =
  26. 26.39² =
  27. 27.44² =
  28. 28.64² =
  29. 29.87² =
  30. 30.51² =
  31. 31.53² =
  32. 32.61² =
  33. 33.88² =
  34. 34.67² =
  35. 35.76² =
  36. 36.59² =
  37. 37.62² =
  38. 38.93² =
  39. 39.43² =
  40. 40.77² =

Answer key

  1. 3025
  2. 2916
  3. 9409
  4. 9216
  5. 8836
  6. 7921
  7. 8281
  8. 5476
  9. 2209
  10. 2116
  11. 6084
  12. 2304
  13. 1681
  14. 6241
  15. 4624
  16. 6561
  17. 2401
  18. 3364
  19. 4761
  20. 1764
  21. 4225
  22. 1089
  23. 3249
  24. 1369
  25. 9604
  26. 1521
  27. 1936
  28. 4096
  29. 7569
  30. 2601
  31. 2809
  32. 3721
  33. 7744
  34. 4489
  35. 5776
  36. 3481
  37. 3844
  38. 8649
  39. 1849
  40. 5929

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