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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 669 · 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. 1.99² =
  2. 2.81² =
  3. 3.63² =
  4. 4.49² =
  5. 5.74² =
  6. 6.61² =
  7. 7.64² =
  8. 8.98² =
  9. 9.78² =
  10. 10.73² =
  11. 11.91² =
  12. 12.51² =
  13. 13.95² =
  14. 14.47² =
  15. 15.33² =
  16. 16.39² =
  17. 17.44² =
  18. 18.85² =
  19. 19.62² =
  20. 20.92² =
  21. 21.45² =
  22. 22.41² =
  23. 23.76² =
  24. 24.59² =
  25. 25.56² =
  26. 26.34² =
  27. 27.43² =
  28. 28.57² =
  29. 29.71² =
  30. 30.89² =
  31. 31.86² =
  32. 32.79² =
  33. 33.68² =
  34. 34.31² =
  35. 35.35² =
  36. 36.82² =
  37. 37.69² =
  38. 38.72² =
  39. 39.38² =
  40. 40.46² =

Answer key

  1. 9801
  2. 6561
  3. 3969
  4. 2401
  5. 5476
  6. 3721
  7. 4096
  8. 9604
  9. 6084
  10. 5329
  11. 8281
  12. 2601
  13. 9025
  14. 2209
  15. 1089
  16. 1521
  17. 1936
  18. 7225
  19. 3844
  20. 8464
  21. 2025
  22. 1681
  23. 5776
  24. 3481
  25. 3136
  26. 1156
  27. 1849
  28. 3249
  29. 5041
  30. 7921
  31. 7396
  32. 6241
  33. 4624
  34. 961
  35. 1225
  36. 6724
  37. 4761
  38. 5184
  39. 1444
  40. 2116

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