EXPLORE ACTIVITY GNS3
Modeling Decimal Multiplication
Use decimal grids or area models to find each product.
0.3 x 0.5
03
0.3 x 0.5 represents 0.3 of 0.5. Shade 5 rows
of the decimal grid to represent 0.5
Shade 0.3 of each 0.1 that is already shaded
0.5
to represent 0.3 of
square(s) are double shaded.
This represents hundredth(s), or 0.15.
0.3 x 0.5
B 3.2 x 2.1
3.2
Use an area model. In the model, the large
squares represent wholes, the small rectangles
along the right and lower edges represent tenths,
and the small squares at the lower right represent
2.1
hundredths. The model is 3 and 2 tenths units long,
and 2 and 1 tenth unit wide.
The area of the model is
whole(s) + tenth(s) + hundredth(s) square units.
3.2 x 2.1
Reflect
1. Analyze Relationships How are the products 2.1 x 3.2 and 21 x 32
alike? How are they different?