# Surf for More Math

## Chapter 6: Addition and Subtraction

**Lesson 2: Counting Back **

Use these interactive activities to encourage students to have fun on the Web while learning about addition and subtraction. Students can try these activities on their own or in pairs.

**Goal**

Count back to solve subtraction stories.

[C, ME, PS]

**Instructions for Use**

**Bowling Subtraction** allows students to solve simple subtraction sentences.

You will be shown a subtraction sentence. Type in the correct difference in the empty text box. If you are correct, the bowling ball will release and knock over the pins to model the number sentence. Click “Play Again” to see another subtraction sentence.

**Sum Sense - Subtraction ** allows students to arrange three or four digits to create a subtraction sentence.

Click “Start”. You will be shown some numbers and you need to arrange the numbers to create an addition sentence. Click the “Next” button to get a new set of digits to arrange.

**Take It Away** allows students to practice solving simple subtraction sentences.

Scroll down and click on “Take It Away.” You will be shown a subtraction sentence. Click on the correct answer from the options given. If you are correct, a picture will show the subtraction. Click “Next” to see another subtraction sentence.

**Flower Power** allows students to solve related addition and subtraction sentences.

Students will be shown a fact family of doubles. Students will complete both the addition sentence and the subtraction sentence. If the student gets the correct answer, they will earn a petal on their flower.