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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 476 · 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. 2.88² =
  3. 3.42² =
  4. 4.47² =
  5. 5.56² =
  6. 6.73² =
  7. 7.91² =
  8. 8.98² =
  9. 9.51² =
  10. 10.45² =
  11. 11.81² =
  12. 12.94² =
  13. 13.99² =
  14. 14.61² =
  15. 15.85² =
  16. 16.46² =
  17. 17.41² =
  18. 18.95² =
  19. 19.68² =
  20. 20.67² =
  21. 21.66² =
  22. 22.48² =
  23. 23.83² =
  24. 24.49² =
  25. 25.35² =
  26. 26.36² =
  27. 27.92² =
  28. 28.84² =
  29. 29.71² =
  30. 30.72² =
  31. 31.39² =
  32. 32.57² =
  33. 33.78² =
  34. 34.53² =
  35. 35.76² =
  36. 36.33² =
  37. 37.75² =
  38. 38.74² =
  39. 39.62² =
  40. 40.64² =

Answer key

  1. 9409
  2. 7744
  3. 1764
  4. 2209
  5. 3136
  6. 5329
  7. 8281
  8. 9604
  9. 2601
  10. 2025
  11. 6561
  12. 8836
  13. 9801
  14. 3721
  15. 7225
  16. 2116
  17. 1681
  18. 9025
  19. 4624
  20. 4489
  21. 4356
  22. 2304
  23. 6889
  24. 2401
  25. 1225
  26. 1296
  27. 8464
  28. 7056
  29. 5041
  30. 5184
  31. 1521
  32. 3249
  33. 6084
  34. 2809
  35. 5776
  36. 1089
  37. 5625
  38. 5476
  39. 3844
  40. 4096

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