← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 623 · 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. 2.21² =
  3. 3.49² =
  4. 4.19² =
  5. 5.19² =
  6. 6.79² =
  7. 7.29² =
  8. 8.41² =
  9. 9.89² =
  10. 10.19² =
  11. 11.21² =
  12. 12.31² =
  13. 13.29² =
  14. 14.41² =
  15. 15.59² =
  16. 16.89² =
  17. 17.29² =
  18. 18.71² =
  19. 19.71² =
  20. 20.49² =
  21. 21.61² =
  22. 22.39² =
  23. 23.71² =
  24. 24.49² =
  25. 25.89² =
  26. 26.51² =
  27. 27.19² =
  28. 28.69² =
  29. 29.69² =
  30. 30.29² =
  31. 31.29² =
  32. 32.71² =
  33. 33.39² =
  34. 34.79² =
  35. 35.29² =
  36. 36.21² =
  37. 37.51² =
  38. 38.89² =
  39. 39.19² =
  40. 40.79² =

Answer key

  1. 7921
  2. 441
  3. 2401
  4. 361
  5. 361
  6. 6241
  7. 841
  8. 1681
  9. 7921
  10. 361
  11. 441
  12. 961
  13. 841
  14. 1681
  15. 3481
  16. 7921
  17. 841
  18. 5041
  19. 5041
  20. 2401
  21. 3721
  22. 1521
  23. 5041
  24. 2401
  25. 7921
  26. 2601
  27. 361
  28. 4761
  29. 4761
  30. 841
  31. 841
  32. 5041
  33. 1521
  34. 6241
  35. 841
  36. 441
  37. 2601
  38. 7921
  39. 361
  40. 6241

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