← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 280 · 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. 1.71² =
  2. 2.79² =
  3. 3.21² =
  4. 4.91² =
  5. 5.21² =
  6. 6.61² =
  7. 7.61² =
  8. 8.51² =
  9. 9.29² =
  10. 10.51² =
  11. 11.49² =
  12. 12.39² =
  13. 13.29² =
  14. 14.81² =
  15. 15.39² =
  16. 16.71² =
  17. 17.19² =
  18. 18.79² =
  19. 19.39² =
  20. 20.19² =
  21. 21.31² =
  22. 22.81² =
  23. 23.21² =
  24. 24.39² =
  25. 25.61² =
  26. 26.21² =
  27. 27.41² =
  28. 28.31² =
  29. 29.29² =
  30. 30.71² =
  31. 31.81² =
  32. 32.29² =
  33. 33.31² =
  34. 34.21² =
  35. 35.29² =
  36. 36.29² =
  37. 37.19² =
  38. 38.59² =
  39. 39.29² =
  40. 40.89² =

Answer key

  1. 5041
  2. 6241
  3. 441
  4. 8281
  5. 441
  6. 3721
  7. 3721
  8. 2601
  9. 841
  10. 2601
  11. 2401
  12. 1521
  13. 841
  14. 6561
  15. 1521
  16. 5041
  17. 361
  18. 6241
  19. 1521
  20. 361
  21. 961
  22. 6561
  23. 441
  24. 1521
  25. 3721
  26. 441
  27. 1681
  28. 961
  29. 841
  30. 5041
  31. 6561
  32. 841
  33. 961
  34. 441
  35. 841
  36. 841
  37. 361
  38. 3481
  39. 841
  40. 7921

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