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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 378 · 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. 1.45² =
  2. 2.61² =
  3. 3.91² =
  4. 4.31² =
  5. 5.69² =
  6. 6.72² =
  7. 7.46² =
  8. 8.37² =
  9. 9.98² =
  10. 10.79² =
  11. 11.34² =
  12. 12.44² =
  13. 13.71² =
  14. 14.49² =
  15. 15.66² =
  16. 16.73² =
  17. 17.84² =
  18. 18.82² =
  19. 19.93² =
  20. 20.62² =
  21. 21.64² =
  22. 22.41² =
  23. 23.51² =
  24. 24.63² =
  25. 25.96² =
  26. 26.74² =
  27. 27.48² =
  28. 28.81² =
  29. 29.65² =
  30. 30.88² =
  31. 31.67² =
  32. 32.94² =
  33. 33.39² =
  34. 34.47² =
  35. 35.89² =
  36. 36.95² =
  37. 37.99² =
  38. 38.53² =
  39. 39.55² =
  40. 40.33² =

Answer key

  1. 2025
  2. 3721
  3. 8281
  4. 961
  5. 4761
  6. 5184
  7. 2116
  8. 1369
  9. 9604
  10. 6241
  11. 1156
  12. 1936
  13. 5041
  14. 2401
  15. 4356
  16. 5329
  17. 7056
  18. 6724
  19. 8649
  20. 3844
  21. 4096
  22. 1681
  23. 2601
  24. 3969
  25. 9216
  26. 5476
  27. 2304
  28. 6561
  29. 4225
  30. 7744
  31. 4489
  32. 8836
  33. 1521
  34. 2209
  35. 7921
  36. 9025
  37. 9801
  38. 2809
  39. 3025
  40. 1089

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