4-8 Number Sense to Place Decimal

Place the decimal in the product.

5.01 x 3 = 1503

Place the decimal in the product.

6.22 x 3 = 1866

Place the decimal in the product.

0.9 x 0.9 = 81

Place the decimal in the product.

1.8 x 1.9 =342

Describe the unknown factor.

______ x 5.1 is about 300

Janelle wrote 23.4 for the product of 7.8 x 0.3. Use number sense to decide if Janelle placed the decimal point in the correct place in the product. If it is incorrect, give the correct product.

Which of the following is the missing factor?

_____ x 2.3 = 34.73

CHALLENGE***

Which two factors would give a product of 7.5?