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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 647 · 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. 1.85² =
  2. 2.57² =
  3. 3.76² =
  4. 4.56² =
  5. 5.79² =
  6. 6.98² =
  7. 7.55² =
  8. 8.61² =
  9. 9.95² =
  10. 10.66² =
  11. 11.42² =
  12. 12.81² =
  13. 13.94² =
  14. 14.47² =
  15. 15.99² =
  16. 16.73² =
  17. 17.41² =
  18. 18.62² =
  19. 19.87² =
  20. 20.32² =
  21. 21.36² =
  22. 22.78² =
  23. 23.84² =
  24. 24.43² =
  25. 25.58² =
  26. 26.91² =
  27. 27.86² =
  28. 28.51² =
  29. 29.83² =
  30. 30.46² =
  31. 31.64² =
  32. 32.37² =
  33. 33.35² =
  34. 34.67² =
  35. 35.38² =
  36. 36.71² =
  37. 37.34² =
  38. 38.33² =
  39. 39.45² =
  40. 40.52² =

Answer key

  1. 7225
  2. 3249
  3. 5776
  4. 3136
  5. 6241
  6. 9604
  7. 3025
  8. 3721
  9. 9025
  10. 4356
  11. 1764
  12. 6561
  13. 8836
  14. 2209
  15. 9801
  16. 5329
  17. 1681
  18. 3844
  19. 7569
  20. 1024
  21. 1296
  22. 6084
  23. 7056
  24. 1849
  25. 3364
  26. 8281
  27. 7396
  28. 2601
  29. 6889
  30. 2116
  31. 4096
  32. 1369
  33. 1225
  34. 4489
  35. 1444
  36. 5041
  37. 1156
  38. 1089
  39. 2025
  40. 2704

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