← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 542 · 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. 1.21² =
  2. 2.69² =
  3. 3.81² =
  4. 4.49² =
  5. 5.79² =
  6. 6.69² =
  7. 7.21² =
  8. 8.59² =
  9. 9.19² =
  10. 10.61² =
  11. 11.21² =
  12. 12.31² =
  13. 13.51² =
  14. 14.51² =
  15. 15.19² =
  16. 16.41² =
  17. 17.79² =
  18. 18.71² =
  19. 19.41² =
  20. 20.39² =
  21. 21.91² =
  22. 22.91² =
  23. 23.69² =
  24. 24.79² =
  25. 25.49² =
  26. 26.91² =
  27. 27.29² =
  28. 28.61² =
  29. 29.49² =
  30. 30.19² =
  31. 31.31² =
  32. 32.59² =
  33. 33.39² =
  34. 34.21² =
  35. 35.41² =
  36. 36.91² =
  37. 37.39² =
  38. 38.41² =
  39. 39.19² =
  40. 40.41² =

Answer key

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

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