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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 230 · 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. 2.61² =
  3. 3.33² =
  4. 4.91² =
  5. 5.34² =
  6. 6.47² =
  7. 7.49² =
  8. 8.57² =
  9. 9.79² =
  10. 10.87² =
  11. 11.36² =
  12. 12.65² =
  13. 13.56² =
  14. 14.81² =
  15. 15.43² =
  16. 16.37² =
  17. 17.48² =
  18. 18.76² =
  19. 19.45² =
  20. 20.71² =
  21. 21.89² =
  22. 22.53² =
  23. 23.54² =
  24. 24.73² =
  25. 25.38² =
  26. 26.96² =
  27. 27.68² =
  28. 28.35² =
  29. 29.69² =
  30. 30.72² =
  31. 31.51² =
  32. 32.59² =
  33. 33.78² =
  34. 34.94² =
  35. 35.99² =
  36. 36.31² =
  37. 37.66² =
  38. 38.88² =
  39. 39.42² =
  40. 40.98² =

Answer key

  1. 9409
  2. 3721
  3. 1089
  4. 8281
  5. 1156
  6. 2209
  7. 2401
  8. 3249
  9. 6241
  10. 7569
  11. 1296
  12. 4225
  13. 3136
  14. 6561
  15. 1849
  16. 1369
  17. 2304
  18. 5776
  19. 2025
  20. 5041
  21. 7921
  22. 2809
  23. 2916
  24. 5329
  25. 1444
  26. 9216
  27. 4624
  28. 1225
  29. 4761
  30. 5184
  31. 2601
  32. 3481
  33. 6084
  34. 8836
  35. 9801
  36. 961
  37. 4356
  38. 7744
  39. 1764
  40. 9604

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