Strategies for Composing Tens

Examples and solutions to help Grade 2 students learn how to use mental strategies to relate compositions of 10 tens as 1 hundred to 10 ones as 1 ten.

Common Core Standards: 2.NBT.6, 2.NBT.7, 2.NBT.8, 2.NBT.9

New York State Common Core Math Grade 2, Module 4, Lesson 17

Worksheets for Grade 2

NYS Math Module 4 Grade 2 Lesson 17

Lesson 17 Problem Set

1. Solve mentally.
   a. 2 ones + ________ = 1 ten, 2 + ________ = 10
   2 tens + ________ = 1 hundred, 20 + ________ = 100
   b. 1 ten = ________ + 6 ones, 10 = ________ + 6
   1 hundred = ________ + 6 tens, 100 = ________ + 60
2. Solve mentally.
   a. 3 ones + 7 ones = ________ , 3 + 7 = _________
   3 tens + 7 tens = ________ , 30 + 70 = ________
   13 tens + 7 tens = ________ , 130 + 70 = ________
   b. 6 ones + 4 ones = ________ , 6 + 4 = _________
   16 tens + 4 tens = ________ , 160 + 40 = ________
3. Solve.
   a. 9 ones + 4 ones = ____ ten ____ ones, 9 + 4 = _________
   9 tens + 4 tens = ____ hundred ____ tens, 90 + 40 = ________
   b. 4 ones + 8 ones = ____ ten ____ ones, 4 + 8 = _________
   4 tens + 8 tens = ____ hundred ____ tens, 40 + 80 = ________
4. Fill in the blanks. Rewrite each as an addition sentence with two parts. Use the arrow method.

• Show Video

Lesson 17 Homework

2. Solve mentally.
a. 2 ones + 8 ones = ________
2 + 8 = _________
2 tens + 8 tens = ________
20 + 80 = ________
b. 5 ones + 6 ones = ________
5 + 6 = _________
5 tens + 6 tens = ________
50 + 60 = ________
c. 14 ones + 4 ones = ________
14 + 4 = _________
14 tens + 4 tens = ________
140 + 40 = ________

3. Solve.
a. 6 ones + 5 ones = __ ten __ one
6 + 5 = _________
6 tens + 5 tens = __ hundred __ ten
60 + 50 = ________
b. 5 ones + 7 ones = __ ten __ ones
5 + 7 = _________
5 tens + 7 tens = __ hundred __ tens
50 + 70 = ________
c. 9 ones + 8 ones = __ ten __ ones
9 + 8 = _________
9 tens + 8 tens = __ hundred __ tens
90 + 80 = ________

4. Fill in the blanks. Rewrite each as an addition sentence with two parts.

• Show Video

Try out our new and fun Fraction Concoction Game.

Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.

We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.