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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 426 · 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. 1.57² =
  2. 2.58² =
  3. 3.73² =
  4. 4.98² =
  5. 5.32² =
  6. 6.38² =
  7. 7.92² =
  8. 8.78² =
  9. 9.95² =
  10. 10.83² =
  11. 11.35² =
  12. 12.34² =
  13. 13.75² =
  14. 14.48² =
  15. 15.37² =
  16. 16.54² =
  17. 17.53² =
  18. 18.67² =
  19. 19.79² =
  20. 20.71² =
  21. 21.36² =
  22. 22.44² =
  23. 23.88² =
  24. 24.41² =
  25. 25.66² =
  26. 26.43² =
  27. 27.42² =
  28. 28.74² =
  29. 29.97² =
  30. 30.68² =
  31. 31.81² =
  32. 32.51² =
  33. 33.39² =
  34. 34.55² =
  35. 35.91² =
  36. 36.49² =
  37. 37.52² =
  38. 38.31² =
  39. 39.33² =
  40. 40.61² =

Answer key

  1. 3249
  2. 3364
  3. 5329
  4. 9604
  5. 1024
  6. 1444
  7. 8464
  8. 6084
  9. 9025
  10. 6889
  11. 1225
  12. 1156
  13. 5625
  14. 2304
  15. 1369
  16. 2916
  17. 2809
  18. 4489
  19. 6241
  20. 5041
  21. 1296
  22. 1936
  23. 7744
  24. 1681
  25. 4356
  26. 1849
  27. 1764
  28. 5476
  29. 9409
  30. 4624
  31. 6561
  32. 2601
  33. 1521
  34. 3025
  35. 8281
  36. 2401
  37. 2704
  38. 961
  39. 1089
  40. 3721

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