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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 912 · 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. 1.56² =
  2. 2.81² =
  3. 3.31² =
  4. 4.49² =
  5. 5.57² =
  6. 6.86² =
  7. 7.79² =
  8. 8.47² =
  9. 9.84² =
  10. 10.37² =
  11. 11.92² =
  12. 12.63² =
  13. 13.41² =
  14. 14.62² =
  15. 15.78² =
  16. 16.32² =
  17. 17.35² =
  18. 18.39² =
  19. 19.45² =
  20. 20.96² =
  21. 21.71² =
  22. 22.55² =
  23. 23.61² =
  24. 24.94² =
  25. 25.69² =
  26. 26.44² =
  27. 27.91² =
  28. 28.74² =
  29. 29.89² =
  30. 30.36² =
  31. 31.75² =
  32. 32.72² =
  33. 33.53² =
  34. 34.52² =
  35. 35.48² =
  36. 36.33² =
  37. 37.67² =
  38. 38.85² =
  39. 39.93² =
  40. 40.76² =

Answer key

  1. 3136
  2. 6561
  3. 961
  4. 2401
  5. 3249
  6. 7396
  7. 6241
  8. 2209
  9. 7056
  10. 1369
  11. 8464
  12. 3969
  13. 1681
  14. 3844
  15. 6084
  16. 1024
  17. 1225
  18. 1521
  19. 2025
  20. 9216
  21. 5041
  22. 3025
  23. 3721
  24. 8836
  25. 4761
  26. 1936
  27. 8281
  28. 5476
  29. 7921
  30. 1296
  31. 5625
  32. 5184
  33. 2809
  34. 2704
  35. 2304
  36. 1089
  37. 4489
  38. 7225
  39. 8649
  40. 5776

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