Page 42 - NUMINO TG_3A

012_G3U2_TG_CA 2011.4.6 12:30 PM ˘ ` 025 PDF_In 2540DPI 150LPI T 02Find the Red Ball Unit

Material Number Cards [A1]

2 . Use the given number cards to make the smallest 4-digit number. 2. Students must make the smallest 4-digit
number using the given numbers.
a. b.
2b. When you make a 4-digit number using
2813 0254 0, 2, 5, 4, what numbers can you put in the
thousands place?
The smallest number The smallest number Why can’t you put zero in the thousands
place? If you put a zero in the thousands
1,238 2,045 place, the number will become a 3-digit
number.
c. d. What number in the thousands place will
make the smallest number? Two.
7261 9008
Have students discuss how to make the
The smallest number The smallest number smallest number after they have finished
solving all the problems. Then, summarize the
1,267 8,009 method and explain it to the students.
Making the Smallest 4-Digit Number
Exclude the zero. Put the smallest number in
the thousands place. Put the numbers from
smallest to greatest values in order starting
from the hundreds place.

Explain how to make the smallest 4-digit number using number cards
that include 0.

Since you cannot place 0 for the thousands place, write the smallest number excluding 0 in the
thousands place, and then put rest of the numbers in order from least to greatest,
including 0.

2. Find the Red Ball 17

Problem: Have students make the second smallest number and the second 3762
greatest number for each problem.

Solution: The greatest number is 7,632. Change the number in the ones
to make the second greatest number is 7,623. The smallest
number is 2,367. Change the number in the ones to make the
second smallest number. 2,376.

Answer: 7,623, 2,376

3A Unit 02 025