Activity

5.NBT.2 Explain patterns in the number of zeros of the product when multiplying a number by powers of 10, and explain patterns in the placement of the decimal point when a decimal is multiplied or divided by a power of 10. Use whole -number exponents to denote powers of 10.

Name of Activity: The Game of Target 300

Resources: Extending Multiplication, by Maryann Wickett and Marilyn Burns, pages 92-102

Materials:

• 1 die per pair of students

• Optional: rules of Target 300 (Black-line Masters)

Directions/Student Activities:

Students take turns rolling the die and deciding to multiply the number rolled by 10, 20, 30, 40, or 50, keeping in mind that each player will have six turns and the target amount is 300. Students document the multiplication sentences on a recording sheet or in their journals. After six turns each, players compare scores to see whose score is closest to 300.

Extensions:

• Change the target to 600

• Use two die and decide which to leave as ones and which to turn into tens (If student rolled 6&4, they might choose the problem 4x60)

• Use two die and use both numbers as tens (student rolls 7x2, becomes 70x20)

• Use die as 100's

Discuss with students, their strategies for keeping their scores close to target.

Differentiating:

Students in group two will be able multiply the numbers they roll by ten and twenty using their calculators to help them move through the assessment successful. Then they will discuss what they noticed about place value. They will also use a place value chart to write the numbers in place value order.