← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 380 · 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. 1.41² =
  2. 2.81² =
  3. 3.29² =
  4. 4.29² =
  5. 5.69² =
  6. 6.29² =
  7. 7.51² =
  8. 8.31² =
  9. 9.21² =
  10. 10.41² =
  11. 11.71² =
  12. 12.71² =
  13. 13.41² =
  14. 14.39² =
  15. 15.91² =
  16. 16.19² =
  17. 17.49² =
  18. 18.39² =
  19. 19.51² =
  20. 20.39² =
  21. 21.59² =
  22. 22.51² =
  23. 23.21² =
  24. 24.21² =
  25. 25.41² =
  26. 26.61² =
  27. 27.89² =
  28. 28.89² =
  29. 29.31² =
  30. 30.69² =
  31. 31.81² =
  32. 32.81² =
  33. 33.41² =
  34. 34.19² =
  35. 35.51² =
  36. 36.49² =
  37. 37.19² =
  38. 38.29² =
  39. 39.21² =
  40. 40.79² =

Answer key

  1. 1681
  2. 6561
  3. 841
  4. 841
  5. 4761
  6. 841
  7. 2601
  8. 961
  9. 441
  10. 1681
  11. 5041
  12. 5041
  13. 1681
  14. 1521
  15. 8281
  16. 361
  17. 2401
  18. 1521
  19. 2601
  20. 1521
  21. 3481
  22. 2601
  23. 441
  24. 441
  25. 1681
  26. 3721
  27. 7921
  28. 7921
  29. 961
  30. 4761
  31. 6561
  32. 6561
  33. 1681
  34. 361
  35. 2601
  36. 2401
  37. 361
  38. 841
  39. 441
  40. 6241

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