← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 859 · 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. 1.91² =
  2. 2.29² =
  3. 3.51² =
  4. 4.91² =
  5. 5.79² =
  6. 6.41² =
  7. 7.29² =
  8. 8.81² =
  9. 9.21² =
  10. 10.61² =
  11. 11.79² =
  12. 12.41² =
  13. 13.31² =
  14. 14.51² =
  15. 15.41² =
  16. 16.69² =
  17. 17.29² =
  18. 18.91² =
  19. 19.31² =
  20. 20.81² =
  21. 21.31² =
  22. 22.49² =
  23. 23.89² =
  24. 24.21² =
  25. 25.39² =
  26. 26.89² =
  27. 27.19² =
  28. 28.49² =
  29. 29.21² =
  30. 30.91² =
  31. 31.69² =
  32. 32.81² =
  33. 33.31² =
  34. 34.39² =
  35. 35.59² =
  36. 36.69² =
  37. 37.19² =
  38. 38.19² =
  39. 39.59² =
  40. 40.61² =

Answer key

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

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