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01Number of Squares Unit
Material Base-ten blocks
Math VoCabulary digit: any symbol used to write whole numbers
4 Look at the base-ten blocks below. Write how many ones, tens, Instruct students on how to count 3-digit
numbers by showing them blocks of ones,
and hundreds in standard, expanded, and word forms. tens, and hundreds.
a 4a. Show students 3 base-hundred blocks
and ask the following questions.
Hundreds Tens Ones How many ones are there in 3 hundreds?
300.
b (Show 2 base-tens blocks.)
How many ones are there in 2 tens? 20.
Hundreds Tens Ones (Write “300” on the board.)
How do you read this number? Three
475 hundred. (Write “24” on the board.)
How do you read this number? Twenty-
400 + 70 + 5 = 475 four.
(Write “324” on the board.)
four hundred seventy-five How do you read 324? Three hundred
twenty-four.
c
4c. Tell students that 10 ones blocks are the
Hundreds Tens Ones same as 1 tens block.
How many ones are there? 12.
7 3 12 How many tens blocks do you need to
make 10 ones? 1.
700 + 30 + 12 = 742 If you regroup the ones and carry the 10
ones to the tens place, how many tens and
seven hundred forty-two ones do you have? 4 tens and 2 ones.
How many blocks are there in total? 742.
d
4d. Have students regroup the tens. Tell
Hundreds Tens Ones them that 10 tens blocks are the same as 1
2 13 1 hundreds block.
200 + 130 + 1 = 331
three hundred thirty-one
1. Number of Squares 5
Hundred vs. Hundreds
Explain to students that when reading “352,” they must use the word “hundred” and say, “three hundred
fifty-two.” When talking about number values, have them say, “3 hundreds, 5 tens, and 2 ones.” To talk
about a digit in a place value, have them say, “3 is in the hundreds place.”
2A Unit 01 007
Material Base-ten blocks
Math VoCabulary digit: any symbol used to write whole numbers
4 Look at the base-ten blocks below. Write how many ones, tens, Instruct students on how to count 3-digit
numbers by showing them blocks of ones,
and hundreds in standard, expanded, and word forms. tens, and hundreds.
a 4a. Show students 3 base-hundred blocks
and ask the following questions.
Hundreds Tens Ones How many ones are there in 3 hundreds?
300.
b (Show 2 base-tens blocks.)
How many ones are there in 2 tens? 20.
Hundreds Tens Ones (Write “300” on the board.)
How do you read this number? Three
475 hundred. (Write “24” on the board.)
How do you read this number? Twenty-
400 + 70 + 5 = 475 four.
(Write “324” on the board.)
four hundred seventy-five How do you read 324? Three hundred
twenty-four.
c
4c. Tell students that 10 ones blocks are the
Hundreds Tens Ones same as 1 tens block.
How many ones are there? 12.
7 3 12 How many tens blocks do you need to
make 10 ones? 1.
700 + 30 + 12 = 742 If you regroup the ones and carry the 10
ones to the tens place, how many tens and
seven hundred forty-two ones do you have? 4 tens and 2 ones.
How many blocks are there in total? 742.
d
4d. Have students regroup the tens. Tell
Hundreds Tens Ones them that 10 tens blocks are the same as 1
2 13 1 hundreds block.
200 + 130 + 1 = 331
three hundred thirty-one
1. Number of Squares 5
Hundred vs. Hundreds
Explain to students that when reading “352,” they must use the word “hundred” and say, “three hundred
fifty-two.” When talking about number values, have them say, “3 hundreds, 5 tens, and 2 ones.” To talk
about a digit in a place value, have them say, “3 is in the hundreds place.”
2A Unit 01 007
