A great way to master addition is to look at patterns.
A pattern is a group of numbers, shapes, or things that repeat over and over.
For example, the shapes below are arranged in a pattern.
🍒🍓🍒🍓🍒🍓🍒🍓
What shape comes next?
Yes, a cherry! 🍒
How did you figure that out?
Great. You looked at the shapes and figured out a rule for how they repeat.
We can also find patterns in addition.
Let's complete this pattern:
The largest digits, 3 and 5, are the same in each equation.
Let's solve the first equation:
3 + 5 = 8
3 ones + 5 ones = 8 ones
The second equation is:
30 + 50 = 80
3 tens + 5 tens = 8 tens
The third equation is:
300 + 500 = 800
3 hundreds + 5 hundreds = 8 hundreds
The last equation:
3,000 + 5,000 = 8,000
Here are the solutions:
What do you notice about the sums?
Yes, they increase by 10x each time.
Let's come up with a rule for this pattern:
If you multiply each addend by 10, your sum will get multiplied by 10.
Tip: Addends are the numbers you add together to get a sum.
Now, let's look at another addition pattern.
Let's complete this pattern together:
Start with the first equation.
_____ + 4 = 12
What number do we add to 4 to make 12? 🤔
We can use subtraction to find the answer.
12 - 4 = 8
The missing number is 8.
8 + 4 = 12
Let's fill in the missing numbers for the other equations.
80 + 40 = 120
800 + 400 = 1,200
8,000 + 4,000 = 12,000
Tip: If we add a 0 to the sum, we have to add 0's to each addend as well to keep the equation true.
Great job learning about addition patterns. 🎉
Now, complete the practice. Patterns are fun.