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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 523 · 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. 1.97² =
  2. 2.59² =
  3. 3.65² =
  4. 4.93² =
  5. 5.84² =
  6. 6.57² =
  7. 7.38² =
  8. 8.49² =
  9. 9.47² =
  10. 10.51² =
  11. 11.43² =
  12. 12.32² =
  13. 13.58² =
  14. 14.69² =
  15. 15.96² =
  16. 16.41² =
  17. 17.34² =
  18. 18.81² =
  19. 19.89² =
  20. 20.74² =
  21. 21.33² =
  22. 22.98² =
  23. 23.35² =
  24. 24.73² =
  25. 25.45² =
  26. 26.36² =
  27. 27.78² =
  28. 28.39² =
  29. 29.52² =
  30. 30.94² =
  31. 31.87² =
  32. 32.46² =
  33. 33.44² =
  34. 34.99² =
  35. 35.83² =
  36. 36.48² =
  37. 37.66² =
  38. 38.68² =
  39. 39.72² =
  40. 40.61² =

Answer key

  1. 9409
  2. 3481
  3. 4225
  4. 8649
  5. 7056
  6. 3249
  7. 1444
  8. 2401
  9. 2209
  10. 2601
  11. 1849
  12. 1024
  13. 3364
  14. 4761
  15. 9216
  16. 1681
  17. 1156
  18. 6561
  19. 7921
  20. 5476
  21. 1089
  22. 9604
  23. 1225
  24. 5329
  25. 2025
  26. 1296
  27. 6084
  28. 1521
  29. 2704
  30. 8836
  31. 7569
  32. 2116
  33. 1936
  34. 9801
  35. 6889
  36. 2304
  37. 4356
  38. 4624
  39. 5184
  40. 3721

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