← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 84 · 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. 1.21² =
  2. 2.39² =
  3. 3.19² =
  4. 4.71² =
  5. 5.61² =
  6. 6.91² =
  7. 7.59² =
  8. 8.41² =
  9. 9.41² =
  10. 10.79² =
  11. 11.21² =
  12. 12.49² =
  13. 13.49² =
  14. 14.19² =
  15. 15.21² =
  16. 16.31² =
  17. 17.41² =
  18. 18.21² =
  19. 19.91² =
  20. 20.51² =
  21. 21.41² =
  22. 22.89² =
  23. 23.51² =
  24. 24.41² =
  25. 25.49² =
  26. 26.31² =
  27. 27.81² =
  28. 28.39² =
  29. 29.29² =
  30. 30.29² =
  31. 31.59² =
  32. 32.61² =
  33. 33.59² =
  34. 34.89² =
  35. 35.39² =
  36. 36.71² =
  37. 37.89² =
  38. 38.59² =
  39. 39.41² =
  40. 40.49² =

Answer key

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

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