← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 274 · 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. 1.71² =
  2. 2.81² =
  3. 3.59² =
  4. 4.39² =
  5. 5.21² =
  6. 6.59² =
  7. 7.71² =
  8. 8.89² =
  9. 9.41² =
  10. 10.69² =
  11. 11.69² =
  12. 12.71² =
  13. 13.89² =
  14. 14.39² =
  15. 15.51² =
  16. 16.39² =
  17. 17.31² =
  18. 18.59² =
  19. 19.59² =
  20. 20.39² =
  21. 21.61² =
  22. 22.41² =
  23. 23.29² =
  24. 24.59² =
  25. 25.21² =
  26. 26.61² =
  27. 27.59² =
  28. 28.19² =
  29. 29.49² =
  30. 30.41² =
  31. 31.29² =
  32. 32.59² =
  33. 33.41² =
  34. 34.59² =
  35. 35.19² =
  36. 36.19² =
  37. 37.29² =
  38. 38.49² =
  39. 39.89² =
  40. 40.61² =

Answer key

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

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