← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 64 · 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. 1.69² =
  2. 2.59² =
  3. 3.29² =
  4. 4.79² =
  5. 5.29² =
  6. 6.31² =
  7. 7.19² =
  8. 8.91² =
  9. 9.71² =
  10. 10.49² =
  11. 11.81² =
  12. 12.39² =
  13. 13.39² =
  14. 14.49² =
  15. 15.81² =
  16. 16.21² =
  17. 17.61² =
  18. 18.61² =
  19. 19.29² =
  20. 20.21² =
  21. 21.49² =
  22. 22.71² =
  23. 23.39² =
  24. 24.19² =
  25. 25.69² =
  26. 26.39² =
  27. 27.19² =
  28. 28.39² =
  29. 29.41² =
  30. 30.31² =
  31. 31.89² =
  32. 32.19² =
  33. 33.29² =
  34. 34.81² =
  35. 35.21² =
  36. 36.39² =
  37. 37.31² =
  38. 38.39² =
  39. 39.31² =
  40. 40.71² =

Answer key

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

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