# What is the counting up method?

## What is the counting up method?

The counting up method involves viewing a subtraction problem from a perspective that focuses on adding. Write out your subtraction problem. For example, you may have 327 – 168. Figure out what must be added to the ones column of the smaller number to reach the next 10s number.

**What is the difference between counting on and counting up?**

Many of your students are probably already using this strategy without knowing it. Counting on means that you start with the biggest number and then count up from there. For example, to add 5+3, start with the “5” and then count up, “6, 7, 8.” This is to discourage students from counting like this: “1, 2, 3, 4, 5…..

### What is ballpark calculation?

A ballpark figure is a broad numerical estimate of what something might amount to if it was measured accurately, assessed for the purpose of business negotiations, dealmaking, or general brainstorming of ideas.

**What is ball park estimation?**

A ballpark figure is a rough statistical estimate or an estimate of value otherwise unknown. Accountants, salespersons, and other professionals commonly use ballpark figures to estimate current or future results.

## What is general rule of estimation?

1 ) If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. Example: 108 rounded to the nearest ten is 110. and nearest hundred = 100. 2 ) If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down. Example: 103 rounded to the nearest ten is 100 .

**How do you teach students to estimate?**

They’re sure to make estimation more meaningful for your students.

- Teach them the “ish” concept.
- Estimate a handful of snacks.
- Introduce estimation jars.
- Build number sense with estimation activities.
- Estimate how many it takes to fill a shape.
- Use building blocks to estimate length.
- Learn to estimate volume.