← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 797 · 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. 2.59² =
  3. 3.49² =
  4. 4.71² =
  5. 5.79² =
  6. 6.79² =
  7. 7.29² =
  8. 8.19² =
  9. 9.81² =
  10. 10.21² =
  11. 11.49² =
  12. 12.21² =
  13. 13.31² =
  14. 14.19² =
  15. 15.29² =
  16. 16.29² =
  17. 17.89² =
  18. 18.39² =
  19. 19.29² =
  20. 20.41² =
  21. 21.61² =
  22. 22.51² =
  23. 23.39² =
  24. 24.51² =
  25. 25.19² =
  26. 26.19² =
  27. 27.19² =
  28. 28.31² =
  29. 29.29² =
  30. 30.31² =
  31. 31.39² =
  32. 32.61² =
  33. 33.21² =
  34. 34.69² =
  35. 35.59² =
  36. 36.39² =
  37. 37.19² =
  38. 38.71² =
  39. 39.31² =
  40. 40.91² =

Answer key

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

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