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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 314 · 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. 1.48² =
  2. 2.55² =
  3. 3.49² =
  4. 4.92² =
  5. 5.75² =
  6. 6.65² =
  7. 7.51² =
  8. 8.95² =
  9. 9.53² =
  10. 10.98² =
  11. 11.61² =
  12. 12.41² =
  13. 13.32² =
  14. 14.66² =
  15. 15.33² =
  16. 16.54² =
  17. 17.97² =
  18. 18.39² =
  19. 19.73² =
  20. 20.46² =
  21. 21.89² =
  22. 22.81² =
  23. 23.45² =
  24. 24.62² =
  25. 25.68² =
  26. 26.35² =
  27. 27.87² =
  28. 28.72² =
  29. 29.59² =
  30. 30.47² =
  31. 31.79² =
  32. 32.74² =
  33. 33.78² =
  34. 34.69² =
  35. 35.94² =
  36. 36.82² =
  37. 37.36² =
  38. 38.44² =
  39. 39.31² =
  40. 40.83² =

Answer key

  1. 2304
  2. 3025
  3. 2401
  4. 8464
  5. 5625
  6. 4225
  7. 2601
  8. 9025
  9. 2809
  10. 9604
  11. 3721
  12. 1681
  13. 1024
  14. 4356
  15. 1089
  16. 2916
  17. 9409
  18. 1521
  19. 5329
  20. 2116
  21. 7921
  22. 6561
  23. 2025
  24. 3844
  25. 4624
  26. 1225
  27. 7569
  28. 5184
  29. 3481
  30. 2209
  31. 6241
  32. 5476
  33. 6084
  34. 4761
  35. 8836
  36. 6724
  37. 1296
  38. 1936
  39. 961
  40. 6889

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