SME
Grade 1 Math · Operations & Algebraic Thinking
Add in any order or grouping
Use this for “Add 3 + 8 + 2. Which two numbers make a ten?”
Picture
Every train: 13 cubes
This is an example. Type the numbers from your problem to start.
First number
+
Second number
+
Third number
=
Total
Number sentences
Add the first two first: 3 + 8 + 2 = 13
Add the last two first: 3 + 8 + 2 = 13
Change the order: 2 + 8 + 3 = 13
Good to know
•
Changing the order doesn’t change the total: 3 + 5 = 5 + 3.
•
Add any two first. The total is the same: 3 + 8 + 2 = 3 + 10.
•
Pick two that are easy to add, like a ten.
Step-by-step
WE KNOW
First number: 3
Second number: 8
Third number: 2
FIND
total
Step 1 · Find total
Add the first two first: 3 + 8 + 2 = ?
Find two numbers that make a ten. Add them first. Then add the other.
Make a ten first: 8 + 2 = 10
10 + 3 = 13
Total: 13
Check
Put the numbers back in. Both sides should match.
Add the first two first: 3 + 8 + 2 = 13 ✓
Add the last two first: 3 + 8 + 2 = 13 ✓
Change the order: 2 + 8 + 3 = 13 ✓
Topic check
See what you know: 5 questions on this topic
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