← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 924 · 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. 1.61² =
  2. 2.89² =
  3. 3.59² =
  4. 4.59² =
  5. 5.49² =
  6. 6.89² =
  7. 7.49² =
  8. 8.21² =
  9. 9.61² =
  10. 10.39² =
  11. 11.59² =
  12. 12.69² =
  13. 13.49² =
  14. 14.59² =
  15. 15.49² =
  16. 16.21² =
  17. 17.19² =
  18. 18.29² =
  19. 19.19² =
  20. 20.41² =
  21. 21.29² =
  22. 22.79² =
  23. 23.89² =
  24. 24.21² =
  25. 25.81² =
  26. 26.89² =
  27. 27.19² =
  28. 28.89² =
  29. 29.71² =
  30. 30.21² =
  31. 31.59² =
  32. 32.21² =
  33. 33.21² =
  34. 34.79² =
  35. 35.21² =
  36. 36.31² =
  37. 37.81² =
  38. 38.79² =
  39. 39.39² =
  40. 40.81² =

Answer key

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

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