## 10 More Or 10 Less

#### Aligned To Common Core Standard:

**Grade 1 Numbers** - 1.NBT.5

We may see this concept and feel it almost too simple to use any class time to go over. I mean after all it is simply adding or subtracting a value of 1 from the tens place value. Students often do not instantly get this concept and you will need to devote some time to reinforcing the concepts. I find it helpful to use a tens place flip chart with this skill. You can then pivot into practicing this by using a skip counting activity in either the form of a worksheet or blackboard activity. When students have a good handle on this it will become a basic mental math exercise for them. Below you will find a series of worksheets that reinforce this concept. You will also find a great number of extra lessons for students that may be a bit behind on this concept. Either way you have more materials to work with here than you will ever need to teach or learn this concept.

- Tens Place Work Step-by-step Lesson- We
ask you to move tens place in four problems.

- Drawing Guided Lesson - We
ask you to count apples on a tree and even draw apples on the tree.

- Guided Lesson Explanation
- This is a simple and straight forward set of instructions.

- Ducks Add 10s Practice - Add
a tens place repeatedly on these problems.

- Matching More or Less -
Find stars that contain numbers that are 10 more or less than the
numbers they give you.

#### Guided Lessons

The skills we explore here will serve you well to retain on to your next grade level.

- Step-by-step Lesson 1 - We give you a number. You tell us what is up or down a tens place.
- Step-by-step Lesson 2 - This will really help you when rounding too.
- Step-by-step Lesson 3 - We keep the streak alive and keep working away at it.
- Step-by-step Lesson 4 - Fill in the missing tens places.
- Step-by-step Lesson 5 - See if your counts will help you out here.

#### Practice Worksheets

The questions that we see here are very commonly found on State exams.

- Operations Based Problems Independent Practice - We take those skill and roll them into basic operations problems.
- Practice Worksheet 1 - We turn five problems into ten questions for you.
- Practice Worksheet 2- Continue on the same path with these.
- Practice Worksheet 3 - See if skip counting by tens will help you here. Long story short, it will!

### How to Quickly Calculate 10 More or 10 Less of a Number

Counting is not just 1 to 10; it is infinite. It will not stop ever. You see, everything around is just mathematics, defined in number. In many instances, we are faced with situations when we must calculate 10 more quickly or 10 less into a number, aren't we? Learning to jump from numbers to numbers will not only save us time but also enhance your cognitive ability. Let us jump into it to find how you can quickly calculate sums by adding 10 more or 10 less. Use a number chart from 1 to 100- Use a number chart, with numbers listed from 1 to 100, identify one more than, one less than, then jump to learning 10 more than, and 10 less than a given number. Use objects to add on or take away- Learning becomes easy when you have things in hand to count on. Take building blocks, small plastic animals or any object, separate a few objects and then add 10 more to it. Count the objects in total. Then take away 10 and count again. Draw lines- The easiest way is to draw 10 lines on a piece of paper and count. Examine the difference when calculating 10 more/ less to a few already drawn lines.

### What is the Base-Ten Number System?

A numeration system is method of using symbols to represent numbers.Every number in the entire system must be represented by a different symbol or series of symbols.If this were not true, there would be a great deal of confusion between people that where communicating these values.Place value based numeration systems have a limited number of symbols that are used repeatedly in order to signify larger values.In this case the order or position in which the symbols are presented indicates the overall value of the number in question.The base-ten number system is used by most of the world today.In this system the starting place holder value of the system is the value zero which is equivalent to having nothing.The value can then reach a maximum of nine. Any value higher than nine will be moved on to the next place value.There is no clear understanding of why this season is based on the number ten.It was thought that it may be that humans have ten fingers, which made it easier to count on your hands or feet for that matter.With the worksheets present on this page you can see that each move of 10 more or less is just a single positional move in the base-ten number system.