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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 125 · 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. 1.65² =
  2. 2.79² =
  3. 3.68² =
  4. 4.97² =
  5. 5.99² =
  6. 6.71² =
  7. 7.51² =
  8. 8.49² =
  9. 9.66² =
  10. 10.35² =
  11. 11.63² =
  12. 12.61² =
  13. 13.41² =
  14. 14.46² =
  15. 15.86² =
  16. 16.81² =
  17. 17.74² =
  18. 18.85² =
  19. 19.56² =
  20. 20.94² =
  21. 21.42² =
  22. 22.53² =
  23. 23.98² =
  24. 24.91² =
  25. 25.82² =
  26. 26.32² =
  27. 27.39² =
  28. 28.44² =
  29. 29.69² =
  30. 30.75² =
  31. 31.36² =
  32. 32.83² =
  33. 33.59² =
  34. 34.96² =
  35. 35.43² =
  36. 36.33² =
  37. 37.72² =
  38. 38.78² =
  39. 39.52² =
  40. 40.34² =

Answer key

  1. 4225
  2. 6241
  3. 4624
  4. 9409
  5. 9801
  6. 5041
  7. 2601
  8. 2401
  9. 4356
  10. 1225
  11. 3969
  12. 3721
  13. 1681
  14. 2116
  15. 7396
  16. 6561
  17. 5476
  18. 7225
  19. 3136
  20. 8836
  21. 1764
  22. 2809
  23. 9604
  24. 8281
  25. 6724
  26. 1024
  27. 1521
  28. 1936
  29. 4761
  30. 5625
  31. 1296
  32. 6889
  33. 3481
  34. 9216
  35. 1849
  36. 1089
  37. 5184
  38. 6084
  39. 2704
  40. 1156

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