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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 44 · 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. 1.34² =
  2. 2.38² =
  3. 3.35² =
  4. 4.32² =
  5. 5.82² =
  6. 6.59² =
  7. 7.92² =
  8. 8.48² =
  9. 9.54² =
  10. 10.52² =
  11. 11.61² =
  12. 12.84² =
  13. 13.51² =
  14. 14.89² =
  15. 15.91² =
  16. 16.77² =
  17. 17.57² =
  18. 18.78² =
  19. 19.81² =
  20. 20.85² =
  21. 21.43² =
  22. 22.69² =
  23. 23.55² =
  24. 24.88² =
  25. 25.71² =
  26. 26.39² =
  27. 27.64² =
  28. 28.62² =
  29. 29.67² =
  30. 30.65² =
  31. 31.31² =
  32. 32.72² =
  33. 33.96² =
  34. 34.87² =
  35. 35.93² =
  36. 36.33² =
  37. 37.98² =
  38. 38.49² =
  39. 39.97² =
  40. 40.75² =

Answer key

  1. 1156
  2. 1444
  3. 1225
  4. 1024
  5. 6724
  6. 3481
  7. 8464
  8. 2304
  9. 2916
  10. 2704
  11. 3721
  12. 7056
  13. 2601
  14. 7921
  15. 8281
  16. 5929
  17. 3249
  18. 6084
  19. 6561
  20. 7225
  21. 1849
  22. 4761
  23. 3025
  24. 7744
  25. 5041
  26. 1521
  27. 4096
  28. 3844
  29. 4489
  30. 4225
  31. 961
  32. 5184
  33. 9216
  34. 7569
  35. 8649
  36. 1089
  37. 9604
  38. 2401
  39. 9409
  40. 5625

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