← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 603 · 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. 1.61² =
  2. 2.71² =
  3. 3.89² =
  4. 4.29² =
  5. 5.89² =
  6. 6.19² =
  7. 7.21² =
  8. 8.39² =
  9. 9.49² =
  10. 10.91² =
  11. 11.71² =
  12. 12.91² =
  13. 13.31² =
  14. 14.19² =
  15. 15.79² =
  16. 16.91² =
  17. 17.89² =
  18. 18.91² =
  19. 19.81² =
  20. 20.71² =
  21. 21.21² =
  22. 22.41² =
  23. 23.29² =
  24. 24.31² =
  25. 25.79² =
  26. 26.51² =
  27. 27.79² =
  28. 28.29² =
  29. 29.59² =
  30. 30.51² =
  31. 31.89² =
  32. 32.39² =
  33. 33.91² =
  34. 34.69² =
  35. 35.71² =
  36. 36.79² =
  37. 37.89² =
  38. 38.61² =
  39. 39.39² =
  40. 40.81² =

Answer key

  1. 3721
  2. 5041
  3. 7921
  4. 841
  5. 7921
  6. 361
  7. 441
  8. 1521
  9. 2401
  10. 8281
  11. 5041
  12. 8281
  13. 961
  14. 361
  15. 6241
  16. 8281
  17. 7921
  18. 8281
  19. 6561
  20. 5041
  21. 441
  22. 1681
  23. 841
  24. 961
  25. 6241
  26. 2601
  27. 6241
  28. 841
  29. 3481
  30. 2601
  31. 7921
  32. 1521
  33. 8281
  34. 4761
  35. 5041
  36. 6241
  37. 7921
  38. 3721
  39. 1521
  40. 6561

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