← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 529 · 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. 1.89² =
  2. 2.91² =
  3. 3.31² =
  4. 4.21² =
  5. 5.61² =
  6. 6.41² =
  7. 7.31² =
  8. 8.21² =
  9. 9.39² =
  10. 10.29² =
  11. 11.39² =
  12. 12.59² =
  13. 13.81² =
  14. 14.61² =
  15. 15.29² =
  16. 16.41² =
  17. 17.19² =
  18. 18.89² =
  19. 19.51² =
  20. 20.41² =
  21. 21.59² =
  22. 22.79² =
  23. 23.19² =
  24. 24.79² =
  25. 25.71² =
  26. 26.19² =
  27. 27.39² =
  28. 28.39² =
  29. 29.89² =
  30. 30.89² =
  31. 31.31² =
  32. 32.79² =
  33. 33.51² =
  34. 34.89² =
  35. 35.89² =
  36. 36.39² =
  37. 37.29² =
  38. 38.19² =
  39. 39.21² =
  40. 40.71² =

Answer key

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

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