Addition and Subtraction
368 + 124 =
492
Kate has 3 dogs.
She gives each dog 6 treats.
How many treats does Kate give her dogs in all?
6 + 6 + 6 = 18
Kate gives her dogs 18 treats in all.
Jim says 16 is an even number. Do you agree? Tell how you know.
I agree with Jim.
I know 16 is even because there is a 6 in the ones place. Numbers that end in 2, 4, 6, 8, or 0 are even.
16 is the sum of a doubles fact.
16 can make pairs with none left over.
Show 4 rows of 5. Write two repeated addition equations to match the array.
4 + 4 + 4 + 4 + 4 = 20
5 + 5 + 5 + 5 = 20
2 columns of six + 2 columns of six
4 columns of six
574 + 396 =
970
There are 6 friends.
Each friend has 4 balloons.
How many balloons do they have in all?
4 + 4 + 4 + 4 + 4 + 4 = 24
They have 24 balloons in all.
Jack says that 20 is an even number. Do you agree? Tell how you know.
I agree with Jack.
I know 20 is even because there is a 6 in the ones place. Numbers that end in 2, 4, 6, 8, or 0 are even.
20 is the sum of a doubles fact. 10 + 10 = 20
20 can make pairs with none left over.
Show 2 rows of 9. Write two repeated addition equations to match the array.
9 + 9 = 18
2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 = 18
5 rows of three + 1 row of three
4 rows of three
596 - 378 =
218
Ming finds some shells.
He puts them all in 5 rows of 4.
How many shells does Ming find in all?
4 + 4 + 4 + 4 + 4 = 20
Ming finds 20 shells.
Katie says that 19 is an even number. Do you agree? Tell how you know.
I disagree with Katie.
I know 19 is odd because there is a 9 in the ones place. Numbers that end in 2, 4, 6, 8, or 0 are even. So 9 in the ones place means that it is odd.
19 is not the sum of a doubles fact.
19 can not make pairs. There will be one left over.
Show 4 columns of 3. Write two repeated addition equations to match the array.
4 + 4 + 4 = 12
3 + 3 + 3 + 3 = 12
5 columns of two + 3 columns of two
8 columns of two
764 - 397 =
367
Tim has some marbles.
He puts them all in 8 columns of 3.
How many marbles does Tim have in all?
3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 = 24
Tim has 24 marbles.
Is 17 even or odd. Tell how you know.
17 is odd.
I know 17 is odd because there is a 7 in the ones place. Numbers that end in 2, 4, 6, 8, or 0 are even. So 7 in the ones place means that it is odd.
17 is not the sum of a doubles fact.
17 can not make pairs. There will be one left over.
Make an array with 20 tiles. Write two number sentences to match.
Student shows correct array with number sentence.
2 columns of six + 2 columns of six
4 columns of six
802 - 615 =
187
There are 2 rows of 3 cranberry muffins.
There are 3 rows of 3 apple muffins.
There is 1 row of 3 banana muffins.
How many muffins are there in all?
3 + 3 + 3 + 3 + 3 + 3 = 18
There are 18 muffins in all.
Is 612 even or odd?
612 is even.
I know 612 is even because there is a 2 in the ones place. Numbers that end in 2, 4, 6, 8, or 0 are even. So 2 in the ones place means that it is even.
612 is the sum of a doubles fact.
612 can make pairs.
Make an array with 12 tiles. Write 2 number sentences to match.
Student shows correct array with number sentence.
4 rows of 5 + ___?__ rows of 5 = 5 rows of 5
What kind of array is shown?
Write a repeated addition equation to match this array.
1 row of 5
This is a square array.
5 + 5 + 5 + 5 + 5 = 25
This is the only repeated addition equation that matches this square array.