← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 585 · 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. 1.71² =
  2. 2.49² =
  3. 3.59² =
  4. 4.91² =
  5. 5.59² =
  6. 6.49² =
  7. 7.19² =
  8. 8.41² =
  9. 9.39² =
  10. 10.41² =
  11. 11.81² =
  12. 12.31² =
  13. 13.41² =
  14. 14.89² =
  15. 15.69² =
  16. 16.29² =
  17. 17.51² =
  18. 18.31² =
  19. 19.89² =
  20. 20.19² =
  21. 21.49² =
  22. 22.91² =
  23. 23.21² =
  24. 24.41² =
  25. 25.49² =
  26. 26.49² =
  27. 27.91² =
  28. 28.69² =
  29. 29.91² =
  30. 30.61² =
  31. 31.59² =
  32. 32.21² =
  33. 33.49² =
  34. 34.71² =
  35. 35.29² =
  36. 36.19² =
  37. 37.81² =
  38. 38.89² =
  39. 39.89² =
  40. 40.61² =

Answer key

  1. 5041
  2. 2401
  3. 3481
  4. 8281
  5. 3481
  6. 2401
  7. 361
  8. 1681
  9. 1521
  10. 1681
  11. 6561
  12. 961
  13. 1681
  14. 7921
  15. 4761
  16. 841
  17. 2601
  18. 961
  19. 7921
  20. 361
  21. 2401
  22. 8281
  23. 441
  24. 1681
  25. 2401
  26. 2401
  27. 8281
  28. 4761
  29. 8281
  30. 3721
  31. 3481
  32. 441
  33. 2401
  34. 5041
  35. 841
  36. 361
  37. 6561
  38. 7921
  39. 7921
  40. 3721

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