unit one math for grade 4 elementary school

2. Lesson 1 Numbers to 100 000
Reading & writing 5-digit numbers
• 1000 = one thousand
• 10 000 = 10 thousand (ten thousand)
• 100 000 = 1 hundred thousand (one hundred thousand)
Example 1:
Q: How to write 23 567 in words?
A: Twenty-three thousand, five hundred and sixty-seven.

3. Example 2:
Q: How to write sixty-four thousand, five hundred and twent-eight?
A: 64 528.
Example 4:
Find the missing numbers!
a. 203 415 = 200 000 + 0 + 3 000 + 400 + 10 + 5
b. 234 567 = 200 000 + 30 000 + 4 000 + 500 + 60 + 7
Example 3:
Q: write in figures please!
ten thousand, seven hundred and thirty-two.
A: 10 732.

4. Example 4:
Q: Write the place and value of each digit in the number 657 128!
A:
Digit Place Value
6 hundred thousands 600 000
5 ten thousands 50 000
7 thousands 7 000
1 hundreds 100
2 tens 20
8 ones 8

5. Question 2:
How to write sixty-one thousand, three hundred and eighty-five in
numerals?
Question 1:
How to write 43 526 in words?
Question 3:
Find the missing numbers!
a. 57 8264 =
b. 67 4215 =

6. Comparing and ordering numbers to 100 000
Example:
Using a place value chart.
Ten
Thousands
Thousands Hundreds Tens Ones
9 3 0 8 5
9 6 1 0 5
Compare the
ten thousands.
The ten
thousand are
equal
Compare the
thousands. 3
thousands is
smaller than
6 thousands.
93 085 is smaller than 96 105.
96 205 is greater than 93 085.

7. Arrange the numbers in increasing and decreasing order
Example:
Arrange these numbers in increasing order
Ten
Thousands
Thousands Hundreds Tens Ones
9 3 0 8 5
9 6 1 0 5
Compare the
ten thousands.
The ten
thousand are
equal
Compare the
thousands. 3
thousands is
smaller than
6 thousands.
93 085, 96 105.
93 085
96 105

8. Number Patterns

9. Rounding and estimation
Example 1:
Round to the nearest ten.
Look at the digit in the ones place.
If it is 1, 2, 3 or 4, round to the smaller ten.
If it s 5, 6, 7, 8 or 9, round to the greater ten.
Q :Round 42 to the nearest ten.
A : 42 is 40 when rounded to the nearest ten.
42 ≈ 40

10. Example 2
Round to the nearest hundred
Look at the digit in the tens place.
If it is 1, 2, 3 or 4, round to the smaller hundred.
If it is 5, 6, 7, 8 or 9 round to the greater hundred.
Q : round 1387 to the nearest hundred
A : 1387 is 1400 when is rounded to the nearest hundred.
1387 ≈ 1400

11. Example 3
Round to the nearest thousand
Look at the digit in the hundreds place.
If it is 1, 2, 3 or 4, round to the smaller thousand.
If it is 5, 6, 7, 8 or 9, round to the greater thousand.
Q : round 7300 to the nearest thousand.
A : 7300 is 7000 when rounded to the nearest thousand
7300 ≈7000