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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 996 · 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. 2.41² =
  3. 3.61² =
  4. 4.73² =
  5. 5.72² =
  6. 6.63² =
  7. 7.89² =
  8. 8.42² =
  9. 9.46² =
  10. 10.92² =
  11. 11.75² =
  12. 12.98² =
  13. 13.57² =
  14. 14.43² =
  15. 15.52² =
  16. 16.62² =
  17. 17.48² =
  18. 18.71² =
  19. 19.88² =
  20. 20.36² =
  21. 21.58² =
  22. 22.95² =
  23. 23.32² =
  24. 24.54² =
  25. 25.55² =
  26. 26.76² =
  27. 27.66² =
  28. 28.87² =
  29. 29.96² =
  30. 30.33² =
  31. 31.91² =
  32. 32.35² =
  33. 33.56² =
  34. 34.37² =
  35. 35.47² =
  36. 36.79² =
  37. 37.99² =
  38. 38.97² =
  39. 39.38² =
  40. 40.84² =

Answer key

  1. 961
  2. 1681
  3. 3721
  4. 5329
  5. 5184
  6. 3969
  7. 7921
  8. 1764
  9. 2116
  10. 8464
  11. 5625
  12. 9604
  13. 3249
  14. 1849
  15. 2704
  16. 3844
  17. 2304
  18. 5041
  19. 7744
  20. 1296
  21. 3364
  22. 9025
  23. 1024
  24. 2916
  25. 3025
  26. 5776
  27. 4356
  28. 7569
  29. 9216
  30. 1089
  31. 8281
  32. 1225
  33. 3136
  34. 1369
  35. 2209
  36. 6241
  37. 9801
  38. 9409
  39. 1444
  40. 7056

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