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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 905 · 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. 1.53² =
  2. 2.42² =
  3. 3.96² =
  4. 4.37² =
  5. 5.91² =
  6. 6.61² =
  7. 7.67² =
  8. 8.84² =
  9. 9.78² =
  10. 10.43² =
  11. 11.41² =
  12. 12.35² =
  13. 13.75² =
  14. 14.46² =
  15. 15.51² =
  16. 16.83² =
  17. 17.45² =
  18. 18.38² =
  19. 19.98² =
  20. 20.85² =
  21. 21.57² =
  22. 22.52² =
  23. 23.55² =
  24. 24.47² =
  25. 25.81² =
  26. 26.69² =
  27. 27.59² =
  28. 28.62² =
  29. 29.48² =
  30. 30.99² =
  31. 31.87² =
  32. 32.56² =
  33. 33.71² =
  34. 34.54² =
  35. 35.34² =
  36. 36.64² =
  37. 37.89² =
  38. 38.44² =
  39. 39.97² =
  40. 40.33² =

Answer key

  1. 2809
  2. 1764
  3. 9216
  4. 1369
  5. 8281
  6. 3721
  7. 4489
  8. 7056
  9. 6084
  10. 1849
  11. 1681
  12. 1225
  13. 5625
  14. 2116
  15. 2601
  16. 6889
  17. 2025
  18. 1444
  19. 9604
  20. 7225
  21. 3249
  22. 2704
  23. 3025
  24. 2209
  25. 6561
  26. 4761
  27. 3481
  28. 3844
  29. 2304
  30. 9801
  31. 7569
  32. 3136
  33. 5041
  34. 2916
  35. 1156
  36. 4096
  37. 7921
  38. 1936
  39. 9409
  40. 1089

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