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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 839 · 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. 1.51² =
  2. 2.53² =
  3. 3.76² =
  4. 4.87² =
  5. 5.68² =
  6. 6.35² =
  7. 7.57² =
  8. 8.31² =
  9. 9.79² =
  10. 10.46² =
  11. 11.38² =
  12. 12.34² =
  13. 13.81² =
  14. 14.44² =
  15. 15.43² =
  16. 16.71² =
  17. 17.83² =
  18. 18.52² =
  19. 19.72² =
  20. 20.61² =
  21. 21.36² =
  22. 22.39² =
  23. 23.75² =
  24. 24.96² =
  25. 25.32² =
  26. 26.55² =
  27. 27.73² =
  28. 28.63² =
  29. 29.69² =
  30. 30.59² =
  31. 31.86² =
  32. 32.48² =
  33. 33.82² =
  34. 34.95² =
  35. 35.78² =
  36. 36.33² =
  37. 37.37² =
  38. 38.74² =
  39. 39.88² =
  40. 40.98² =

Answer key

  1. 2601
  2. 2809
  3. 5776
  4. 7569
  5. 4624
  6. 1225
  7. 3249
  8. 961
  9. 6241
  10. 2116
  11. 1444
  12. 1156
  13. 6561
  14. 1936
  15. 1849
  16. 5041
  17. 6889
  18. 2704
  19. 5184
  20. 3721
  21. 1296
  22. 1521
  23. 5625
  24. 9216
  25. 1024
  26. 3025
  27. 5329
  28. 3969
  29. 4761
  30. 3481
  31. 7396
  32. 2304
  33. 6724
  34. 9025
  35. 6084
  36. 1089
  37. 1369
  38. 5476
  39. 7744
  40. 9604

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