← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 871 · 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. 1.39² =
  2. 2.21² =
  3. 3.59² =
  4. 4.49² =
  5. 5.51² =
  6. 6.19² =
  7. 7.31² =
  8. 8.51² =
  9. 9.19² =
  10. 10.21² =
  11. 11.29² =
  12. 12.29² =
  13. 13.69² =
  14. 14.51² =
  15. 15.41² =
  16. 16.29² =
  17. 17.29² =
  18. 18.89² =
  19. 19.51² =
  20. 20.69² =
  21. 21.51² =
  22. 22.31² =
  23. 23.21² =
  24. 24.69² =
  25. 25.79² =
  26. 26.29² =
  27. 27.91² =
  28. 28.71² =
  29. 29.81² =
  30. 30.89² =
  31. 31.31² =
  32. 32.41² =
  33. 33.81² =
  34. 34.21² =
  35. 35.29² =
  36. 36.81² =
  37. 37.71² =
  38. 38.21² =
  39. 39.81² =
  40. 40.21² =

Answer key

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

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