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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 14 · 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. 1.42² =
  2. 2.92² =
  3. 3.98² =
  4. 4.53² =
  5. 5.64² =
  6. 6.89² =
  7. 7.63² =
  8. 8.39² =
  9. 9.54² =
  10. 10.34² =
  11. 11.31² =
  12. 12.55² =
  13. 13.65² =
  14. 14.56² =
  15. 15.88² =
  16. 16.82² =
  17. 17.38² =
  18. 18.71² =
  19. 19.46² =
  20. 20.83² =
  21. 21.52² =
  22. 22.61² =
  23. 23.67² =
  24. 24.91² =
  25. 25.49² =
  26. 26.35² =
  27. 27.78² =
  28. 28.99² =
  29. 29.62² =
  30. 30.48² =
  31. 31.81² =
  32. 32.72² =
  33. 33.32² =
  34. 34.59² =
  35. 35.75² =
  36. 36.47² =
  37. 37.33² =
  38. 38.41² =
  39. 39.66² =
  40. 40.37² =

Answer key

  1. 1764
  2. 8464
  3. 9604
  4. 2809
  5. 4096
  6. 7921
  7. 3969
  8. 1521
  9. 2916
  10. 1156
  11. 961
  12. 3025
  13. 4225
  14. 3136
  15. 7744
  16. 6724
  17. 1444
  18. 5041
  19. 2116
  20. 6889
  21. 2704
  22. 3721
  23. 4489
  24. 8281
  25. 2401
  26. 1225
  27. 6084
  28. 9801
  29. 3844
  30. 2304
  31. 6561
  32. 5184
  33. 1024
  34. 3481
  35. 5625
  36. 2209
  37. 1089
  38. 1681
  39. 4356
  40. 1369

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