← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 14 · 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. 1.29² =
  2. 2.51² =
  3. 3.51² =
  4. 4.71² =
  5. 5.59² =
  6. 6.79² =
  7. 7.41² =
  8. 8.31² =
  9. 9.19² =
  10. 10.71² =
  11. 11.29² =
  12. 12.59² =
  13. 13.69² =
  14. 14.51² =
  15. 15.69² =
  16. 16.91² =
  17. 17.81² =
  18. 18.29² =
  19. 19.51² =
  20. 20.31² =
  21. 21.91² =
  22. 22.31² =
  23. 23.21² =
  24. 24.69² =
  25. 25.19² =
  26. 26.41² =
  27. 27.39² =
  28. 28.19² =
  29. 29.49² =
  30. 30.59² =
  31. 31.61² =
  32. 32.29² =
  33. 33.59² =
  34. 34.41² =
  35. 35.61² =
  36. 36.81² =
  37. 37.59² =
  38. 38.29² =
  39. 39.19² =
  40. 40.49² =

Answer key

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

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