← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 498 · 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. 1.91² =
  2. 2.69² =
  3. 3.69² =
  4. 4.41² =
  5. 5.21² =
  6. 6.69² =
  7. 7.29² =
  8. 8.49² =
  9. 9.81² =
  10. 10.49² =
  11. 11.21² =
  12. 12.21² =
  13. 13.29² =
  14. 14.29² =
  15. 15.31² =
  16. 16.31² =
  17. 17.29² =
  18. 18.79² =
  19. 19.21² =
  20. 20.71² =
  21. 21.19² =
  22. 22.29² =
  23. 23.91² =
  24. 24.89² =
  25. 25.69² =
  26. 26.41² =
  27. 27.39² =
  28. 28.49² =
  29. 29.89² =
  30. 30.81² =
  31. 31.61² =
  32. 32.91² =
  33. 33.29² =
  34. 34.39² =
  35. 35.19² =
  36. 36.21² =
  37. 37.31² =
  38. 38.51² =
  39. 39.61² =
  40. 40.31² =

Answer key

  1. 8281
  2. 4761
  3. 4761
  4. 1681
  5. 441
  6. 4761
  7. 841
  8. 2401
  9. 6561
  10. 2401
  11. 441
  12. 441
  13. 841
  14. 841
  15. 961
  16. 961
  17. 841
  18. 6241
  19. 441
  20. 5041
  21. 361
  22. 841
  23. 8281
  24. 7921
  25. 4761
  26. 1681
  27. 1521
  28. 2401
  29. 7921
  30. 6561
  31. 3721
  32. 8281
  33. 841
  34. 1521
  35. 361
  36. 441
  37. 961
  38. 2601
  39. 3721
  40. 961

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