Skip to content

Learn

Squares

Level 26 / mastery

4d square D1:7-9 (low)

5 visual steps / 4-digit square split

1. Split thousands

7123^21. Split thousands split into base and tail 7123=7000+123base square7000^249000000double product_tail square_
7123 as 7000 + 123.

7123 as 7000 + 123.

2. Double product

7123^22. Double product split into base and tail 7123=7000+123base square7000^249000000double product2 x 7000 x 1231722000tail square_
2 x 7000 x 123 = 1722000.

2 x 7000 x 123 = 1722000.

3. Tail square

7123^23. Tail square split into base and tail 7123=7000+123base square7000^249000000double product2 x 7000 x 1231722000tail square123^215129
123^2 = 15129.

123^2 = 15129.

4. Combine parts

7123^24. Combine parts split into base and tail 7123=7000+123base square7000^249000000double product2 x 7000 x 1231722000tail square123^21512949000000 + 1722000 + 15129 = 50737129
49000000 + 1722000 + 15129 = 50737129.

49000000 + 1722000 + 15129 = 50737129.

5. Read answer

7123^25. Read answer Read answer 7123^2 = 50737129Read 7123^2 = 50737129; nearby7100^2 = 50410000 checks size.
Read 7123^2 = 50737129; nearby 7100^2 = 50410000 checks size.

Read 7123^2 = 50737129; nearby 7100^2 = 50410000 checks size.

Practice Level 26

Use the visible move, then type only when the answer is clear.

Start Level