← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 969 · 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. 3.81² =
  4. 4.21² =
  5. 5.41² =
  6. 6.39² =
  7. 7.49² =
  8. 8.31² =
  9. 9.49² =
  10. 10.19² =
  11. 11.51² =
  12. 12.79² =
  13. 13.29² =
  14. 14.41² =
  15. 15.29² =
  16. 16.31² =
  17. 17.31² =
  18. 18.19² =
  19. 19.51² =
  20. 20.29² =
  21. 21.19² =
  22. 22.21² =
  23. 23.71² =
  24. 24.19² =
  25. 25.39² =
  26. 26.49² =
  27. 27.31² =
  28. 28.59² =
  29. 29.31² =
  30. 30.29² =
  31. 31.89² =
  32. 32.61² =
  33. 33.59² =
  34. 34.51² =
  35. 35.31² =
  36. 36.29² =
  37. 37.71² =
  38. 38.69² =
  39. 39.61² =
  40. 40.29² =

Answer key

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

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