Contributor: Stefani Allegretti. Lesson ID: 14095
Toys, snacks, and more — oh my! You can add them together to get even more fun! Get ready to use your mental math skills to add one and two to numbers in lots of exciting ways!
Imagine a friend sharing a toy with you.
Using mental math, you can figure this out and much more, just by thinking!
Math can be exciting and easy when you know how to add with your mind.
Learn how to use mental math to add one or two to numbers!
Mental math is like a superpower for your brain! You don’t need any pencils or paper — just your amazing mind!
Wow!
Think about your favorite snacks.
Yum!
Pretend you have two cookies.
Then, you get one more cookie.
Use the number line to count!
Start at two (because you had two cookies). Count up one more.
1 ⇒ 2 ⇒ 3
2 + 1 = 3!
You have three cookies altogether!
Great work!
Now try another one, but this time with some toy cars!
Imagine you have four toy cars.
Now, you add two more toy cars.
Use the number line to count up from four.
Start at four and count up two more.
4 ⇒ 5 ⇒ 6
4 + 2 = 6!
Watch the video below to see this cool math trick in action!
There sure is!
You can use your fingers!
Five on one hand and five on the other!
Watch this video to practice!
Hold up two fingers, like in the picture below.
Then, hold up two more fingers.
Four!
Keep holding up those four fingers!
1 ⇒ 2 ⇒ 3 ⇒ 4 ⇒ 5
4 + 1 = 5 !
You got it!
You learned how to add one or two to a number!
Now, practice with more fun activities in the Got It? section.