← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 954 · 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. 1.89² =
  2. 2.81² =
  3. 3.89² =
  4. 4.29² =
  5. 5.89² =
  6. 6.81² =
  7. 7.29² =
  8. 8.29² =
  9. 9.69² =
  10. 10.59² =
  11. 11.81² =
  12. 12.31² =
  13. 13.49² =
  14. 14.59² =
  15. 15.49² =
  16. 16.59² =
  17. 17.79² =
  18. 18.49² =
  19. 19.51² =
  20. 20.79² =
  21. 21.31² =
  22. 22.49² =
  23. 23.69² =
  24. 24.39² =
  25. 25.69² =
  26. 26.89² =
  27. 27.71² =
  28. 28.81² =
  29. 29.89² =
  30. 30.59² =
  31. 31.19² =
  32. 32.91² =
  33. 33.71² =
  34. 34.71² =
  35. 35.41² =
  36. 36.31² =
  37. 37.69² =
  38. 38.81² =
  39. 39.19² =
  40. 40.79² =

Answer key

  1. 7921
  2. 6561
  3. 7921
  4. 841
  5. 7921
  6. 6561
  7. 841
  8. 841
  9. 4761
  10. 3481
  11. 6561
  12. 961
  13. 2401
  14. 3481
  15. 2401
  16. 3481
  17. 6241
  18. 2401
  19. 2601
  20. 6241
  21. 961
  22. 2401
  23. 4761
  24. 1521
  25. 4761
  26. 7921
  27. 5041
  28. 6561
  29. 7921
  30. 3481
  31. 361
  32. 8281
  33. 5041
  34. 5041
  35. 1681
  36. 961
  37. 4761
  38. 6561
  39. 361
  40. 6241

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