We are working on adding and subtracting numbers in units of ten. We are using both the hundred chart (if you use this source, scroll down a bit and wait for it to load) and skip counting. We have used the hundred chart quite often and have discovered that any time we need to know a number that is ten more, it is under the starting number. If we need a number that is ten less, it is above the starting number. If your child is not sure of this, please practice. Play 100 Number Grid. Each time your child finds the correct placement of the number, ask them what number would be 10 more than that number as well as what number would be 10 less than that number. They should work towards not having to count by ones to determine the answer. Once that is mastered, ask what numbers would be 20 more/less. Gradually increase difficulty.
COMMENT BOX: When you find the sum for 57 + 30, which digit changes? The tens or the ones? How many tens are you adding? Remember to include your name.
13 comments:
Blake Cabral
The tens change. You are adding 3 tens (lines) on the hundred chart. The answer is 87.
Malia Speedy
57
+30
____
87
The 5 changed to an 8.
It is in the tens column.
I added 3 tens to the 57.
Donovan
The tens change
Adding 3 tens
57+30=87
87
the tens changed
Lily
57
+30
____
87
Tens place changes
Add 5 tens + 3 tens
Gideon
87, tens changes,added 3 10s
Gavin and Ansley
Tens. Three.
Sophie Hampton
57+30=87
the tens, adding 3 tens
Kaleb
Chloe
When you find the sum of 57 + 30, which is 87, the tens digit changes. We are adding 8 tens altogether.
Courtney
The 5 changes because you start at 57 and go down 3 and it will be 87
courtney
The tens change. we are adding 3 tens
Tyler
The tens change. We add 3 tens to 57.
johnny
57+30=87
the tens digit changes by 3
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