MA19.1.15

Mathematics (2019) Grade(s): 1

MA19.1.15
Subtract multiples of 10 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. Relate the strategy to a written method and explain the reasoning used.

Unpacked Content

Knowledge

Students know:

place value models for adding and subtracting numbers less than 100.
Strategies for adding and subtracting multiples of 10.

Skills

Students are able to:

use models and strategies to find and record solutions to problems where a multiple of 10 is subtracted.
Explain their strategies.

Understanding

Students understand that:

patterns in the place value system can be used to mentally compute sums and differences.

Vocabulary

Multiple of 10

Aligned Learning Resources

Peg and Cat: Counting by Tens

Modeling Base Ten Addition and Subtraction

Design by Adaptive Theme