← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 214 · 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. 1.69² =
  2. 2.41² =
  3. 3.19² =
  4. 4.69² =
  5. 5.21² =
  6. 6.19² =
  7. 7.59² =
  8. 8.19² =
  9. 9.51² =
  10. 10.51² =
  11. 11.49² =
  12. 12.41² =
  13. 13.51² =
  14. 14.19² =
  15. 15.31² =
  16. 16.19² =
  17. 17.49² =
  18. 18.41² =
  19. 19.19² =
  20. 20.39² =
  21. 21.19² =
  22. 22.29² =
  23. 23.49² =
  24. 24.19² =
  25. 25.91² =
  26. 26.79² =
  27. 27.39² =
  28. 28.91² =
  29. 29.51² =
  30. 30.19² =
  31. 31.19² =
  32. 32.31² =
  33. 33.19² =
  34. 34.41² =
  35. 35.29² =
  36. 36.81² =
  37. 37.31² =
  38. 38.61² =
  39. 39.21² =
  40. 40.81² =

Answer key

  1. 4761
  2. 1681
  3. 361
  4. 4761
  5. 441
  6. 361
  7. 3481
  8. 361
  9. 2601
  10. 2601
  11. 2401
  12. 1681
  13. 2601
  14. 361
  15. 961
  16. 361
  17. 2401
  18. 1681
  19. 361
  20. 1521
  21. 361
  22. 841
  23. 2401
  24. 361
  25. 8281
  26. 6241
  27. 1521
  28. 8281
  29. 2601
  30. 361
  31. 361
  32. 961
  33. 361
  34. 1681
  35. 841
  36. 6561
  37. 961
  38. 3721
  39. 441
  40. 6561

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