← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 835 · 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. 1.79² =
  2. 2.19² =
  3. 3.91² =
  4. 4.29² =
  5. 5.31² =
  6. 6.79² =
  7. 7.19² =
  8. 8.61² =
  9. 9.69² =
  10. 10.81² =
  11. 11.49² =
  12. 12.41² =
  13. 13.21² =
  14. 14.59² =
  15. 15.49² =
  16. 16.41² =
  17. 17.29² =
  18. 18.31² =
  19. 19.89² =
  20. 20.59² =
  21. 21.19² =
  22. 22.69² =
  23. 23.89² =
  24. 24.29² =
  25. 25.21² =
  26. 26.31² =
  27. 27.29² =
  28. 28.29² =
  29. 29.19² =
  30. 30.41² =
  31. 31.91² =
  32. 32.91² =
  33. 33.29² =
  34. 34.31² =
  35. 35.69² =
  36. 36.91² =
  37. 37.31² =
  38. 38.31² =
  39. 39.69² =
  40. 40.89² =

Answer key

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

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