Description
What our Mental Math 10 More or Less lesson plan includes
Lesson Objectives: Mental Math 10 More or Less engages concept imagery and leverages sensory stimulation to develop mental math skills in young students. Reinforcing vocabulary, identifying the mental math strategy for adding or subtracting 10, and providing ample practice problems anchors the concept of mental math as an efficient strategy and allows students to develop comfort and skill using mental math. At the end of the lesson, students will be able to mentally add and subtract 10 from a two-digit number. This lesson is for students in 1st grade and 2nd grade.
Classroom Procedure
Every lesson plan provides you with a classroom procedure page that outlines a step-by-step guide to follow. You do not have to follow the guide exactly. The guide helps you organize the lesson and details when to hand out worksheets. It also lists information in the blue box that you might find useful. You will find the lesson objectives, state standards, and number of class sessions the lesson should take to complete in this area. In addition, it describes the supplies you will need as well as what and how you need to prepare beforehand. The supplies you will need for this lesson include scissors and glue.
Options for Lesson
Included with this lesson is an “Options for Lesson” section that lists a number of suggestions for activities to add to the lesson or substitutions for the ones already in the lesson. Many of the suggestions for this lesson relate to the lesson activity. For the activity, if you have more advanced students, you can write more difficult numbers. You could also have students play in larger groups based on their math skill level. If you’d like to include a kinesthetic activity, you could have your students stand up for 10 more and crouch down for 10 less. For an additional activity, you could have your students call out numbers to the class and have students write their answer on a white board to assess their individual understanding.
Teacher Notes
The teacher notes page includes lines that you can use to add your own notes as you’re preparing for this lesson.
MENTAL MATH 10 MORE OR LESS LESSON PLAN CONTENT PAGES
Mental Math 10 More
The Mental Math 10 More or Less lesson plan includes two content pages. It’s easy to add 10 to another number quickly in your head, because you’re only adding one to the tens. You don’t have to add any ones! You can also easily count up by ones on your fingers, or add a group of ten to your base ten blocks.
While all of these are easy methods for adding 10, the easiest way is to picture a hundreds chart (rather than counting on your fingers or using blocks). Once you get used to the hundreds chart, you’ll see that it’s very easy to add 10s in your head!
The lesson includes an example. Say you wanted to add 10 to the number 36 using a hundreds chart. First, you find 36 on the chart. Next, you simply move down one row to find your answer. One row below 36 on a hundreds chart is the number 46, so 36 + 10 = 46!
You could also simply use mental math to add one in your head to the tens column. Using our example, three tens (30) plus one ten (10) is four tens (40). You don’t add any ones so the ones stay the same. This gives you a final answer of 46.
Mental Math 10 Less
It’s just as easy to subtract 10 from another number! Like addition, you can count down on your fingers, take away one base ten block, or use a hundreds chart, but using mental math is the easiest and fastest method.
Using a hundreds chart, you simply find the original number on the chart and move up one row to find your answer. Using mental math, you subtract one from the tens and leave the ones the same. For example, to take 10 away from the number 36, you take one ten (10) away from three tens (30) to get two tens (20). You keep the ones place the same for a final answer of 26.
MENTAL MATH 10 MORE OR LESS LESSON PLAN WORKSHEETS
The Mental Math 10 More or Less lesson plan includes three worksheets: an activity worksheet, a practice worksheet, and a homework assignment. You can refer to the guide on the classroom procedure page to determine when to hand out each worksheet.
I HAVE, WHO HAS…? ACTIVITY WORKSHEET
For the activity worksheet, students will play a game called “I Have, Who Has…?” where they receive a card with a number on it and call it out along with the various prompts on the worksheet. For example, if their card says 15, they would call out “I have 15! Who has 10 more (or less) than 15?”.
CUT AND PASTE PRACTICE WORKSHEET
The practice worksheet asks students to first cut out the hundreds boards included with the worksheet. They will then use it to fill in the missing numbers. For example, they will paste the 9 in the “Ten Less” column and a 29 in the “Ten More” column next to the number 19.
MENTAL MATH HOMEWORK ASSIGNMENT
For the homework assignment, students will use mental math to answer questions. They will write down what is 10 less and 10 more for each of the given numbers.
QUIZ
This lesson also includes a quiz that you can use to test students’ understanding of the lesson material. For the quiz, students will answer four questions using mental math.
Worksheet Answer Keys
This lesson plan includes answer keys for the practice worksheet, the homework assignment, and the quiz. If you choose to administer the lesson pages to your students via PDF, you will need to save a new file that omits these pages. Otherwise, you can simply print out the applicable pages and keep these as reference for yourself when grading assignments.
