Page 39 - NUMINO TG_4A
P. 39
Activity 1 Round Whole Numbers
jOb ective Learn the method of rounding whole numbers.
1. Textbook Instructions Activity 1 Round Whole Numbers
Students will learn how to round whole Learn how to round whole numbers.
numbers.
Show students how to round by using 74,213 Use Rounding Rules
and 257,830 as examples.
Refer to textbook. Round to the nearest thousand.
Have the students understand the method to
rounding before solving each problem. Underline the digit where you want to round to.
If the digit to the right of the underlined digit
is 0-4, the underlined digit does not 1 74,213 2 257,830
change. If the digit to the right is 5-9, the
underlined digit increases by 1. 1 If the digit to the right of the underlined digit is less than 5,
1. Have the students round each number to the underlined digit remains the same. All digits that follow
the nearest hundred.
1b. 3,280 are replaced with zeros.
Underline the digit you want to round to. 2¯5 74,000
3,280
Look at the digit to the right. The digit in 2 If the digit to the right of the underlined digit is greater than
the tens place is 8. Since 8 > 5, the digit 2
needs to be increased by 1. 5, 1 is added to the underlined digit. All digits that follow
Replace all the digits after 3 to be zero.
3,280 3,300 are replaced with zeros.
2. Have the students round each number to 8˘5 258,000
the nearest thousand.
1 . Round each number to the nearest hundred.
a. 850 900 b. 3,280 3,300 c. 7,943 7,900
f. 12,088 12,100
d. 6,128 6,100 e. 9,761 9,800
2 . Round each number to the nearest thousand.
a. 1,400 1,000 b. 7,813 8,000 c. 4,108 4,000
d. 16,220 16,000 e. 29,008 29,000 f. 53,664 54,000
14
2. Build Understanding
Show students the following example as some students may make an error while rounding a similar number.
Example: Round 14,957 to the nearest hundred.
Step 1. Underline the digit that you want to round to. 14,957
Step 2. Look at the digit to the right. The digit in the tens place is 5. Since 5 5, the digit 9 needs to be
increased by 1. Since 9 becomes 10 if increased by 1, the 9 becomes 0, and the thousands place
will increase from 4 to 6.
Step 3. When rounded to the nearest hundred, 14,957 15,000.
022 NUMINO Teacher s Guide
jOb ective Learn the method of rounding whole numbers.
1. Textbook Instructions Activity 1 Round Whole Numbers
Students will learn how to round whole Learn how to round whole numbers.
numbers.
Show students how to round by using 74,213 Use Rounding Rules
and 257,830 as examples.
Refer to textbook. Round to the nearest thousand.
Have the students understand the method to
rounding before solving each problem. Underline the digit where you want to round to.
If the digit to the right of the underlined digit
is 0-4, the underlined digit does not 1 74,213 2 257,830
change. If the digit to the right is 5-9, the
underlined digit increases by 1. 1 If the digit to the right of the underlined digit is less than 5,
1. Have the students round each number to the underlined digit remains the same. All digits that follow
the nearest hundred.
1b. 3,280 are replaced with zeros.
Underline the digit you want to round to. 2¯5 74,000
3,280
Look at the digit to the right. The digit in 2 If the digit to the right of the underlined digit is greater than
the tens place is 8. Since 8 > 5, the digit 2
needs to be increased by 1. 5, 1 is added to the underlined digit. All digits that follow
Replace all the digits after 3 to be zero.
3,280 3,300 are replaced with zeros.
2. Have the students round each number to 8˘5 258,000
the nearest thousand.
1 . Round each number to the nearest hundred.
a. 850 900 b. 3,280 3,300 c. 7,943 7,900
f. 12,088 12,100
d. 6,128 6,100 e. 9,761 9,800
2 . Round each number to the nearest thousand.
a. 1,400 1,000 b. 7,813 8,000 c. 4,108 4,000
d. 16,220 16,000 e. 29,008 29,000 f. 53,664 54,000
14
2. Build Understanding
Show students the following example as some students may make an error while rounding a similar number.
Example: Round 14,957 to the nearest hundred.
Step 1. Underline the digit that you want to round to. 14,957
Step 2. Look at the digit to the right. The digit in the tens place is 5. Since 5 5, the digit 9 needs to be
increased by 1. Since 9 becomes 10 if increased by 1, the 9 becomes 0, and the thousands place
will increase from 4 to 6.
Step 3. When rounded to the nearest hundred, 14,957 15,000.
022 NUMINO Teacher s Guide
