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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 138 · 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. 1.58² =
  2. 2.38² =
  3. 3.77² =
  4. 4.34² =
  5. 5.89² =
  6. 6.82² =
  7. 7.54² =
  8. 8.48² =
  9. 9.32² =
  10. 10.79² =
  11. 11.64² =
  12. 12.45² =
  13. 13.63² =
  14. 14.65² =
  15. 15.41² =
  16. 16.69² =
  17. 17.81² =
  18. 18.96² =
  19. 19.33² =
  20. 20.68² =
  21. 21.67² =
  22. 22.76² =
  23. 23.43² =
  24. 24.47² =
  25. 25.85² =
  26. 26.75² =
  27. 27.97² =
  28. 28.91² =
  29. 29.98² =
  30. 30.59² =
  31. 31.55² =
  32. 32.49² =
  33. 33.88² =
  34. 34.74² =
  35. 35.52² =
  36. 36.71² =
  37. 37.42² =
  38. 38.62² =
  39. 39.87² =
  40. 40.57² =

Answer key

  1. 3364
  2. 1444
  3. 5929
  4. 1156
  5. 7921
  6. 6724
  7. 2916
  8. 2304
  9. 1024
  10. 6241
  11. 4096
  12. 2025
  13. 3969
  14. 4225
  15. 1681
  16. 4761
  17. 6561
  18. 9216
  19. 1089
  20. 4624
  21. 4489
  22. 5776
  23. 1849
  24. 2209
  25. 7225
  26. 5625
  27. 9409
  28. 8281
  29. 9604
  30. 3481
  31. 3025
  32. 2401
  33. 7744
  34. 5476
  35. 2704
  36. 5041
  37. 1764
  38. 3844
  39. 7569
  40. 3249

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