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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 959 · 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. 2.91² =
  3. 3.78² =
  4. 4.33² =
  5. 5.85² =
  6. 6.44² =
  7. 7.38² =
  8. 8.87² =
  9. 9.61² =
  10. 10.55² =
  11. 11.47² =
  12. 12.52² =
  13. 13.41² =
  14. 14.43² =
  15. 15.88² =
  16. 16.32² =
  17. 17.92² =
  18. 18.96² =
  19. 19.81² =
  20. 20.79² =
  21. 21.45² =
  22. 22.82² =
  23. 23.72² =
  24. 24.93² =
  25. 25.53² =
  26. 26.34² =
  27. 27.36² =
  28. 28.98² =
  29. 29.37² =
  30. 30.83² =
  31. 31.49² =
  32. 32.74² =
  33. 33.65² =
  34. 34.48² =
  35. 35.46² =
  36. 36.54² =
  37. 37.51² =
  38. 38.66² =
  39. 39.75² =
  40. 40.42² =

Answer key

  1. 3249
  2. 8281
  3. 6084
  4. 1089
  5. 7225
  6. 1936
  7. 1444
  8. 7569
  9. 3721
  10. 3025
  11. 2209
  12. 2704
  13. 1681
  14. 1849
  15. 7744
  16. 1024
  17. 8464
  18. 9216
  19. 6561
  20. 6241
  21. 2025
  22. 6724
  23. 5184
  24. 8649
  25. 2809
  26. 1156
  27. 1296
  28. 9604
  29. 1369
  30. 6889
  31. 2401
  32. 5476
  33. 4225
  34. 2304
  35. 2116
  36. 2916
  37. 2601
  38. 4356
  39. 5625
  40. 1764

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