← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 138 · 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. 1.51² =
  2. 2.29² =
  3. 3.21² =
  4. 4.61² =
  5. 5.79² =
  6. 6.79² =
  7. 7.21² =
  8. 8.31² =
  9. 9.39² =
  10. 10.19² =
  11. 11.69² =
  12. 12.59² =
  13. 13.61² =
  14. 14.81² =
  15. 15.81² =
  16. 16.69² =
  17. 17.21² =
  18. 18.31² =
  19. 19.69² =
  20. 20.49² =
  21. 21.41² =
  22. 22.31² =
  23. 23.21² =
  24. 24.49² =
  25. 25.91² =
  26. 26.41² =
  27. 27.29² =
  28. 28.29² =
  29. 29.59² =
  30. 30.31² =
  31. 31.51² =
  32. 32.71² =
  33. 33.49² =
  34. 34.51² =
  35. 35.39² =
  36. 36.29² =
  37. 37.69² =
  38. 38.39² =
  39. 39.69² =
  40. 40.41² =

Answer key

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

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