Today we are going to review the Subtraction Strategies we have been learning about.

We will also learn what do to when we are subtracting the same number (like in 10-10=?) or subtracting 0 (like in 10-0=?).

Get ready to subtract!

Subtraction Review video

This week we will be combining 2 things we have learned about: decomposing teen numbers and subtraction.

If you remember, decomposing means “breaking apart,” and we practiced how to decompose teen numbers into 10 and some more (18 is 10 and 8 / 15 is 10 and 5).

Today, we will use this strategy to solve subtraction equations. Find Ms. Ramirez’s video here:
Decomposing Teen Numbers to Solve Subtraction

NOTE: Some students will be able to do this mentally. Others may require to make the number first with manipulatives and then take away. In this case, have them make the number as 1 group of 10 and another group with the rest – i.e. 1= 1 group of 10 and a group of 3.
Both approaches are okay. Meet your child where they are.:)

We continue exploring subtraction as take away, and this week we will be using the “Count back” strategy.

You can watch Ms. Ramirez’ video here:

Counting Back Mentally Strategy video

**NOTE: Counting back mentally is a Grade 1 strategy. Kindergartens can continue using the previous strategies. However, if your Kindergarten child can easily count back, they can try this strategy.
For Grade 1 students, if your child has difficulties counting back with teen numbers (11-20), start with numbers 0-10.

This week’s strategy to solve Subtraction problems is using Number Lines

You can watch Ms. Ramirez’ video explaining the strategy here:

Subtraction using Number Lines

To make your own Number Lines, watch this video:

Make your own Number Line and Learning Menu activity

We used Number Lines to solve addition problems. What is different when using these Number Lines for subtraction? How do we move (towards the bigger numbers or towards the smaller ones)?

This week, we will continue exploring subtraction (take away) and we will learn to use 2 new strategies: Manipulatives (objects) and Drawings.

You can watch Ms. Ramirez’ video here:

Subtraction with Manipulatives Video

Subtraction with Drawings Video

What connections can you make to addition strategies?

How different is it using manipulatives and drawings for subtraction?

Hi Division 16!

I have created a story workshop video to officially introduce our new math topic: subtraction!

Subtraction Story Video

I know many of you already know subtraction, but you can still watch this video to get inspired and create your own subtraction story with bigger numbers.