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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 639 · 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. 1.84² =
  2. 2.91² =
  3. 3.86² =
  4. 4.41² =
  5. 5.52² =
  6. 6.55² =
  7. 7.63² =
  8. 8.74² =
  9. 9.33² =
  10. 10.95² =
  11. 11.38² =
  12. 12.37² =
  13. 13.47² =
  14. 14.67² =
  15. 15.35² =
  16. 16.43² =
  17. 17.45² =
  18. 18.51² =
  19. 19.65² =
  20. 20.82² =
  21. 21.31² =
  22. 22.61² =
  23. 23.53² =
  24. 24.49² =
  25. 25.78² =
  26. 26.98² =
  27. 27.94² =
  28. 28.69² =
  29. 29.79² =
  30. 30.46² =
  31. 31.42² =
  32. 32.57² =
  33. 33.92² =
  34. 34.81² =
  35. 35.59² =
  36. 36.75² =
  37. 37.99² =
  38. 38.66² =
  39. 39.71² =
  40. 40.58² =

Answer key

  1. 7056
  2. 8281
  3. 7396
  4. 1681
  5. 2704
  6. 3025
  7. 3969
  8. 5476
  9. 1089
  10. 9025
  11. 1444
  12. 1369
  13. 2209
  14. 4489
  15. 1225
  16. 1849
  17. 2025
  18. 2601
  19. 4225
  20. 6724
  21. 961
  22. 3721
  23. 2809
  24. 2401
  25. 6084
  26. 9604
  27. 8836
  28. 4761
  29. 6241
  30. 2116
  31. 1764
  32. 3249
  33. 8464
  34. 6561
  35. 3481
  36. 5625
  37. 9801
  38. 4356
  39. 5041
  40. 3364

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