← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 182 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.81² =
  2. 2.31² =
  3. 3.31² =
  4. 4.31² =
  5. 5.21² =
  6. 6.79² =
  7. 7.39² =
  8. 8.71² =
  9. 9.91² =
  10. 10.41² =
  11. 11.79² =
  12. 12.61² =
  13. 13.39² =
  14. 14.21² =
  15. 15.39² =
  16. 16.29² =
  17. 17.21² =
  18. 18.31² =
  19. 19.31² =
  20. 20.39² =
  21. 21.69² =
  22. 22.21² =
  23. 23.71² =
  24. 24.69² =
  25. 25.91² =
  26. 26.49² =
  27. 27.19² =
  28. 28.89² =
  29. 29.89² =
  30. 30.39² =
  31. 31.41² =
  32. 32.19² =
  33. 33.49² =
  34. 34.21² =
  35. 35.19² =
  36. 36.69² =
  37. 37.39² =
  38. 38.81² =
  39. 39.41² =
  40. 40.51² =

Answer key

  1. 6561
  2. 961
  3. 961
  4. 961
  5. 441
  6. 6241
  7. 1521
  8. 5041
  9. 8281
  10. 1681
  11. 6241
  12. 3721
  13. 1521
  14. 441
  15. 1521
  16. 841
  17. 441
  18. 961
  19. 961
  20. 1521
  21. 4761
  22. 441
  23. 5041
  24. 4761
  25. 8281
  26. 2401
  27. 361
  28. 7921
  29. 7921
  30. 1521
  31. 1681
  32. 361
  33. 2401
  34. 441
  35. 361
  36. 4761
  37. 1521
  38. 6561
  39. 1681
  40. 2601

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths