Download 2-Digit Multiplication

2-Digit Multiplication
Engage
whole class and pairs
Key Language
Strategy
Use Option 2 strategies
Hear Math, See Math, Do
Math, Write Math, and
Talk Math, in the Teacher’s
Edition, Differentiated
Instruction, Small Group
Options
Activate Prior Knowledge Review recycling charts with
students. Have their actual amounts and predictions come close?
Have each group present findings.
Explain
Hands-on Lesson Introduce Distributive Property of
Multiplication. Write 5 × 23 on the board. Say: Now we are going to
regroup the numbers. Show how to separate 23 into tens and ones to
regroup and multiply each by 5:
5 × 23 = 5 × (20 + 3)
Language
Objectives
●
Negotiate and
manage interaction to
accomplish tasks.
● Practice new language.
Math Objectives
●
Multiply a 2-digit
number.
● Use the Distributive
Property of
Multiplication.
Math Vocabulary
= (5 × 20) + (5 × 3)
= 100 + 15 = 115
●
Have students play a game using number cubes to form factors for
multiplication problems. Pair fluent and nonfluent speakers. Have
one partner shake out two cubes to form a 2-digit number. Have the
second partner shake out two more cubes to form a 2-digit number.
Have pairs write a multiplication sentence using the 2-digit factors.
●
Distribute Learning Resource 20: 2-Digit Multiplication and have
pairs record their factors and products.
Evaluate
Assessment Check students’ mastery of the Distributive Property
as they complete the lesson. See Assessment Checklist on page 139.
Distributive Property of
Multiplication, regroup
Lesson Vocabulary
cube, shake
Materials
• cups
• number cubes
• Learning Resource 20
66
Lesson 20
Beginning
Oral: Point to a 2-digit
number, and say: Show
me the tens and ones.
Writing: Have them
write a multiplication
sentence using 2-digit
numbers, and then solve
it with regrouping.
Intermediate
Oral: Point to
a multiplication
sentence. Say: Use
the Distributive
Property. Tell me the
new multiplication
sentence.
Writing: Have students
write a multiplication
sentence using the
Distributive Property.
Advanced
Oral: Regroup numbers
and ask: What property
did I just show?
Writing: Have students
write the steps for how
to regroup using the
Distributive Property.
20
Name
2-Digit Multiplication
Use number cubes to make factors. Write each factor. Then use
the Distributive Property of Multiplication to solve.
X
FACTOR
=
PRODUCT
© Macmillan/McGraw-Hill
FACTOR
2-Digit Multiplication
67