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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 895 · 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. 1.49² =
  2. 2.81² =
  3. 3.41² =
  4. 4.44² =
  5. 5.83² =
  6. 6.74² =
  7. 7.38² =
  8. 8.43² =
  9. 9.35² =
  10. 10.72² =
  11. 11.66² =
  12. 12.92² =
  13. 13.91² =
  14. 14.87² =
  15. 15.76² =
  16. 16.48² =
  17. 17.71² =
  18. 18.31² =
  19. 19.57² =
  20. 20.47² =
  21. 21.95² =
  22. 22.59² =
  23. 23.97² =
  24. 24.45² =
  25. 25.79² =
  26. 26.98² =
  27. 27.88² =
  28. 28.69² =
  29. 29.33² =
  30. 30.32² =
  31. 31.37² =
  32. 32.63² =
  33. 33.58² =
  34. 34.51² =
  35. 35.94² =
  36. 36.67² =
  37. 37.61² =
  38. 38.82² =
  39. 39.55² =
  40. 40.53² =

Answer key

  1. 2401
  2. 6561
  3. 1681
  4. 1936
  5. 6889
  6. 5476
  7. 1444
  8. 1849
  9. 1225
  10. 5184
  11. 4356
  12. 8464
  13. 8281
  14. 7569
  15. 5776
  16. 2304
  17. 5041
  18. 961
  19. 3249
  20. 2209
  21. 9025
  22. 3481
  23. 9409
  24. 2025
  25. 6241
  26. 9604
  27. 7744
  28. 4761
  29. 1089
  30. 1024
  31. 1369
  32. 3969
  33. 3364
  34. 2601
  35. 8836
  36. 4489
  37. 3721
  38. 6724
  39. 3025
  40. 2809

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