Question
show place values for 11 X 21
Answers
GPT-5 mini
Method 1 — expanded/place-value form
(10 + 1) × (20 + 1)
= 10×20 + 10×1 + 1×20 + 1×1
= 200 + 10 + 20 + 1
= 231
Method 2 — column/partial products
11
× 21
-----
11 ← 11 × 1 (ones place)
220 ← 11 × 20 (tens; written as 220)
-----
231
Place-value of the result: 231 = 200 (2 hundreds) + 30 (3 tens) + 1 (1 one).
(10 + 1) × (20 + 1)
= 10×20 + 10×1 + 1×20 + 1×1
= 200 + 10 + 20 + 1
= 231
Method 2 — column/partial products
11
× 21
-----
11 ← 11 × 1 (ones place)
220 ← 11 × 20 (tens; written as 220)
-----
231
Place-value of the result: 231 = 200 (2 hundreds) + 30 (3 tens) + 1 (1 one).