← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 21 · 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. 1.31² =
  2. 2.51² =
  3. 3.41² =
  4. 4.31² =
  5. 5.19² =
  6. 6.29² =
  7. 7.61² =
  8. 8.21² =
  9. 9.69² =
  10. 10.89² =
  11. 11.29² =
  12. 12.21² =
  13. 13.31² =
  14. 14.21² =
  15. 15.79² =
  16. 16.79² =
  17. 17.41² =
  18. 18.21² =
  19. 19.59² =
  20. 20.29² =
  21. 21.61² =
  22. 22.81² =
  23. 23.81² =
  24. 24.41² =
  25. 25.21² =
  26. 26.81² =
  27. 27.51² =
  28. 28.31² =
  29. 29.61² =
  30. 30.31² =
  31. 31.29² =
  32. 32.89² =
  33. 33.91² =
  34. 34.29² =
  35. 35.69² =
  36. 36.39² =
  37. 37.49² =
  38. 38.91² =
  39. 39.59² =
  40. 40.71² =

Answer key

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

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