← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 506 · 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. 3.61² =
  4. 4.21² =
  5. 5.19² =
  6. 6.69² =
  7. 7.69² =
  8. 8.31² =
  9. 9.29² =
  10. 10.29² =
  11. 11.19² =
  12. 12.49² =
  13. 13.21² =
  14. 14.19² =
  15. 15.61² =
  16. 16.79² =
  17. 17.31² =
  18. 18.79² =
  19. 19.89² =
  20. 20.29² =
  21. 21.51² =
  22. 22.59² =
  23. 23.39² =
  24. 24.79² =
  25. 25.89² =
  26. 26.91² =
  27. 27.59² =
  28. 28.19² =
  29. 29.49² =
  30. 30.91² =
  31. 31.81² =
  32. 32.21² =
  33. 33.69² =
  34. 34.71² =
  35. 35.79² =
  36. 36.89² =
  37. 37.81² =
  38. 38.71² =
  39. 39.69² =
  40. 40.81² =

Answer key

  1. 7921
  2. 6561
  3. 3721
  4. 441
  5. 361
  6. 4761
  7. 4761
  8. 961
  9. 841
  10. 841
  11. 361
  12. 2401
  13. 441
  14. 361
  15. 3721
  16. 6241
  17. 961
  18. 6241
  19. 7921
  20. 841
  21. 2601
  22. 3481
  23. 1521
  24. 6241
  25. 7921
  26. 8281
  27. 3481
  28. 361
  29. 2401
  30. 8281
  31. 6561
  32. 441
  33. 4761
  34. 5041
  35. 6241
  36. 7921
  37. 6561
  38. 5041
  39. 4761
  40. 6561

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