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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 838 · 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. 1.31² =
  2. 2.43² =
  3. 3.97² =
  4. 4.69² =
  5. 5.94² =
  6. 6.85² =
  7. 7.67² =
  8. 8.57² =
  9. 9.55² =
  10. 10.98² =
  11. 11.33² =
  12. 12.79² =
  13. 13.52² =
  14. 14.41² =
  15. 15.71² =
  16. 16.62² =
  17. 17.75² =
  18. 18.72² =
  19. 19.38² =
  20. 20.68² =
  21. 21.83² =
  22. 22.54² =
  23. 23.44² =
  24. 24.91² =
  25. 25.61² =
  26. 26.37² =
  27. 27.48² =
  28. 28.59² =
  29. 29.35² =
  30. 30.58² =
  31. 31.81² =
  32. 32.84² =
  33. 33.39² =
  34. 34.89² =
  35. 35.77² =
  36. 36.92² =
  37. 37.46² =
  38. 38.87² =
  39. 39.65² =
  40. 40.93² =

Answer key

  1. 961
  2. 1849
  3. 9409
  4. 4761
  5. 8836
  6. 7225
  7. 4489
  8. 3249
  9. 3025
  10. 9604
  11. 1089
  12. 6241
  13. 2704
  14. 1681
  15. 5041
  16. 3844
  17. 5625
  18. 5184
  19. 1444
  20. 4624
  21. 6889
  22. 2916
  23. 1936
  24. 8281
  25. 3721
  26. 1369
  27. 2304
  28. 3481
  29. 1225
  30. 3364
  31. 6561
  32. 7056
  33. 1521
  34. 7921
  35. 5929
  36. 8464
  37. 2116
  38. 7569
  39. 4225
  40. 8649

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