Students will add and subtract all combinations within 20 using a variety of strategies including make-a-ten, doubles, near-doubles, and known fact relationships. Students develop flexible thinking and move toward efficient computation with sums and differences up to 20.
Real questions from this skill, graded here. No account, and nothing is saved.
Add and Subtract within 20 Using Strategies
Grade 1 · Counting, Fluency, and Fact Strategies · question 1 of 3
0 of 12
12 rungs. A star at the top.
Asha sold 9 pears and has 2 left. How many did she start with?
0:00 of 2:48
Pick a fast adding strategy.
Make-a-ten or think-addition can help.
8 + 5: 8 needs 2 more to make 10. Take 2 from the 5, and 3 are left: 10 + 3 = 13.
10 is easy to add to: 10 and 3 is 13 without counting.
The 5 splits into 2 and 3, so no counters are lost or added.
So 8 + 5 is the same as 10 + 3, and both are 13.
Make 10 first, then add what is left.
Counting on 5 from 8 and losing count: 9, 10, 11, 12.
Make 10 with 2 of the 5. 3 are left: 13.
6 + 5 = ___ — 11. 6 and 4 make 10, and 1 more is 11.
Let's add 8 and 7. We can use a smart trick called 'make a ten' to find the answer fast.
Here's our problem: eight plus seven.
First, ask: how many more does 8 need to reach 10?
Just two! Eight plus two makes ten.
So we'll break the 7 into 2 and 5.
Now slide the 2 over to the 8. Eight plus two is ten.
Then add the leftover 5. Ten plus 5 is 15.
So 8 plus 7 equals 15. Making a ten makes it easy!
While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.
A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.
An example student.
Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.
An example week.
14 days of every skill, practice packets, Fluency sheets and up to four students. No card.