teaching resource

Decomposing Numbers - Subtraction Teaching Slides

Updated: 10 Jun 2023

Challenge students to decompose numbers to mentally solve two-digit subtraction problems with a teaching presentation.

Editable: PowerPoint, Google Slides
Pages: 1 Page
Grades: 1 - 2

Curriculum

CCSS.MATH.CONTENT.1.NBT.B.2

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
CCSS.MATH.CONTENT.1.NBT.B.2.A

10 can be thought of as a bundle of ten ones - called a "ten."
CCSS.MATH.CONTENT.1.NBT.B.2.B

The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
CCSS.MATH.CONTENT.1.NBT.B.2.C

The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).
CCSS.MATH.CONTENT.2.OA.B.2

Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
CCSS.MATH.CONTENT.2.NBT.A.2

Count within 1000; skip-count by 5s, 10s, and 100s.
CCSS.MATH.CONTENT.2.NBT.B.6

Add up to four two-digit numbers using strategies based on place value and properties of operations.

teaching resource

Decomposing Numbers - Subtraction Teaching Slides

Updated: 10 Jun 2023

Challenge students to decompose numbers to mentally solve two-digit subtraction problems with a teaching presentation.

Editable: PowerPoint, Google Slides
Pages: 1 Page
Grades: 1 - 2

Challenge students to decompose numbers to mentally solve two-digit subtraction problems with a teaching presentation.

Decomposing Numbers to a Ten to Subtract – Slide Deck!

Students may have mastered decomposing numbers and rearranging the parts in numbers smaller than ten, but can they use the same concept to subtract two-digit numbers?

Use this slide deck with your students who need additional strategies to solve two-digit subtraction problems. They will demonstrate their ability to break apart the subtrahend in an equation into tens and ones and use those simplified numbers to solve the problem mentally.

This teaching presentation outlines the decomposing to a ten subtraction strategy. It includes example slides that break down the steps involved in this strategy and uses animation to help visualize the process.

Easily Download & Teach

Use the dropdown icon on the Download button to choose between the PowerPoint or editable Google Slides version of this resource.

Lindsey Phillips, a teacher in Michigan and Teach Starter collaborator, contributed to this resource

Curriculum

CCSS.MATH.CONTENT.1.NBT.B.2

Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
CCSS.MATH.CONTENT.1.NBT.B.2.A

10 can be thought of as a bundle of ten ones - called a "ten."
CCSS.MATH.CONTENT.1.NBT.B.2.B

The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
CCSS.MATH.CONTENT.1.NBT.B.2.C

The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).
CCSS.MATH.CONTENT.2.OA.B.2

Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
CCSS.MATH.CONTENT.2.NBT.A.2

Count within 1000; skip-count by 5s, 10s, and 100s.
CCSS.MATH.CONTENT.2.NBT.B.6

Add up to four two-digit numbers using strategies based on place value and properties of operations.

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