Topic 3-Using Place Value to Add and Subtract
Dear Family,
Your child is learning to add 2- and 3-digit numbers. It is sometimes
necessary to regroup or “rename” 10 ones as 1 ten, or rename 10 tens as
1 hundred. For example, when adding 124 + 189, you must rename twice.
Your child can also draw pictures of place-value blocks to show addition
of 2- and 3-digit numbers.
Topic 2- Number Sense- Add. and Sub.
Dear Family,
Your child is learning strategies to add and subtract numbers using
mental math. One strategy for solving addition problems using mental
math is to break apart numbers to make a ten because the ten is easier
to add. Here’s an example:
Add 146 + 28.
You can make a 10 by adding 4 to 146.
Break apart 28 into 4 + 24. 146 + 4 =150
150 +24 =174
So, 146 + 28 = 174.
One strategy for solving subtraction problems using mental math is to
use compensation.
Subtract 84 -38.
It is easier to subtract 40. 84 -40 =44
By subtracting 40, you subtracted
2 more than 38.
You must add 2 to the answer. 44 +2 = 46
So, 84 -38 =46.
Your child is also learning to use estimated sums and differences
to check if an answer is reasonable. Help your child practice using
mental math to add and subtract, then estimate to see if an answer is
reasonable. Here is an activity you can do together
Topic 1- Numerations
Dear Family,
Your child is learning to read and write numbers with three, four, five, and six
digits. He or she is learning to use patterns to find missing numbers on a
number line. She or he is learning to compare numbers and order them from
least to greatest or from greatest to least. To do all this, she or he must
understand the concept of place value—that the value of a digit depends on
its place in the number. For example, in the number 7,349, the digit 3 is in the
hundreds place. Its value is 300. Ask your child to name the place and tell you
the value of the other digits in this number (7 in the thousands place is 7,000;
4 in the tens place is 40; 9 in the ones place is 9).
Help your child practice using place value to read numbers and to compare them
to each other.
Dear Family,
Your child is learning to add 2- and 3-digit numbers. It is sometimes
necessary to regroup or “rename” 10 ones as 1 ten, or rename 10 tens as
1 hundred. For example, when adding 124 + 189, you must rename twice.
Your child can also draw pictures of place-value blocks to show addition
of 2- and 3-digit numbers.
Topic 2- Number Sense- Add. and Sub.
Dear Family,
Your child is learning strategies to add and subtract numbers using
mental math. One strategy for solving addition problems using mental
math is to break apart numbers to make a ten because the ten is easier
to add. Here’s an example:
Add 146 + 28.
You can make a 10 by adding 4 to 146.
Break apart 28 into 4 + 24. 146 + 4 =150
150 +24 =174
So, 146 + 28 = 174.
One strategy for solving subtraction problems using mental math is to
use compensation.
Subtract 84 -38.
It is easier to subtract 40. 84 -40 =44
By subtracting 40, you subtracted
2 more than 38.
You must add 2 to the answer. 44 +2 = 46
So, 84 -38 =46.
Your child is also learning to use estimated sums and differences
to check if an answer is reasonable. Help your child practice using
mental math to add and subtract, then estimate to see if an answer is
reasonable. Here is an activity you can do together
Topic 1- Numerations
Dear Family,
Your child is learning to read and write numbers with three, four, five, and six
digits. He or she is learning to use patterns to find missing numbers on a
number line. She or he is learning to compare numbers and order them from
least to greatest or from greatest to least. To do all this, she or he must
understand the concept of place value—that the value of a digit depends on
its place in the number. For example, in the number 7,349, the digit 3 is in the
hundreds place. Its value is 300. Ask your child to name the place and tell you
the value of the other digits in this number (7 in the thousands place is 7,000;
4 in the tens place is 40; 9 in the ones place is 9).
Help your child practice using place value to read numbers and to compare them
to each other.