← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 122 · 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. 1.59² =
  2. 2.59² =
  3. 3.81² =
  4. 4.41² =
  5. 5.51² =
  6. 6.19² =
  7. 7.19² =
  8. 8.49² =
  9. 9.71² =
  10. 10.39² =
  11. 11.41² =
  12. 12.21² =
  13. 13.89² =
  14. 14.51² =
  15. 15.61² =
  16. 16.91² =
  17. 17.29² =
  18. 18.29² =
  19. 19.49² =
  20. 20.21² =
  21. 21.71² =
  22. 22.39² =
  23. 23.29² =
  24. 24.29² =
  25. 25.89² =
  26. 26.89² =
  27. 27.31² =
  28. 28.79² =
  29. 29.41² =
  30. 30.29² =
  31. 31.31² =
  32. 32.41² =
  33. 33.91² =
  34. 34.39² =
  35. 35.79² =
  36. 36.41² =
  37. 37.21² =
  38. 38.29² =
  39. 39.29² =
  40. 40.21² =

Answer key

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

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