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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 936 · 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. 2.43² =
  3. 3.37² =
  4. 4.48² =
  5. 5.68² =
  6. 6.54² =
  7. 7.85² =
  8. 8.49² =
  9. 9.92² =
  10. 10.47² =
  11. 11.58² =
  12. 12.78² =
  13. 13.51² =
  14. 14.62² =
  15. 15.72² =
  16. 16.46² =
  17. 17.55² =
  18. 18.84² =
  19. 19.39² =
  20. 20.91² =
  21. 21.81² =
  22. 22.41² =
  23. 23.96² =
  24. 24.63² =
  25. 25.69² =
  26. 26.53² =
  27. 27.71² =
  28. 28.31² =
  29. 29.44² =
  30. 30.59² =
  31. 31.65² =
  32. 32.38² =
  33. 33.67² =
  34. 34.61² =
  35. 35.76² =
  36. 36.82² =
  37. 37.66² =
  38. 38.35² =
  39. 39.56² =
  40. 40.89² =

Answer key

  1. 3249
  2. 1849
  3. 1369
  4. 2304
  5. 4624
  6. 2916
  7. 7225
  8. 2401
  9. 8464
  10. 2209
  11. 3364
  12. 6084
  13. 2601
  14. 3844
  15. 5184
  16. 2116
  17. 3025
  18. 7056
  19. 1521
  20. 8281
  21. 6561
  22. 1681
  23. 9216
  24. 3969
  25. 4761
  26. 2809
  27. 5041
  28. 961
  29. 1936
  30. 3481
  31. 4225
  32. 1444
  33. 4489
  34. 3721
  35. 5776
  36. 6724
  37. 4356
  38. 1225
  39. 3136
  40. 7921

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