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012_G3U2_TG_CA 2011.4.6 12:30 PM ˘ ` 020 PDF_In 2540DPI 150LPI T
02Unit Find the Red Ball
jOb ective Compare 3-digit numbers.
1. Textbook Instructions UNIT
Have students compare the given 3-digit 02 Find the Red Ball
numbers and find common numbers that can
go in all of the blanks. Find all the possible numbers that can go into all three red balls.
Let’s compare 693 and 89. 693 89
What is the greatest number that can go in 76 763
the blank? Six. 257 29
What are the possible numbers that can
go in the blank? One, two, three, four, and
five.
What number do you get when you put six
in the blank? Six hundred eighty nine.
Which place values do you compare when
you compare the number with 693? The
tens place.
Compare 693 and 689. Can six go in the
blank? Yes.
Let’s compare 76 and 763. Which place
values do you compare? The ones place.
What number can go in the blank?
A number that is bigger than three. Explain why you think so.
What numbers can go in the blank? Numbers 1 to 6 can go in the first blank.
Numbers 4 to 9 can go in the second blank.
Four, five, six, seven, eight, and nine. Numbers 5 to 9 can go in the third blank.
Therefore, 5 and 6 can go in all 3 blanks.
Refer to .
12
2. Build Understanding
693 89 The number in the hundreds must be less than six. So, one, two, three, four, or five can go in the blank. If you
use six, the two numbers in the hundreds place will be equal, so you have to compare the numbers in the
tens place. Eight is smaller than nine, so the sentence will still be true even if you use six in the hundreds.
76 763 The numbers in the hundreds and tens are equal, so compare the numbers in the ones. The number must be
bigger than three, so you can use four, five, six, seven, eight, or nine.
257 2 9 The number in the tens must be bigger than five. So you can use six, seven, eight, or nine. If you want to use
five, the numbers in the hundreds and tens will be equal, so you have to compare the numbers in the ones.
Seven is smaller than nine, so you can use five in the tens place. So, five and six can go in all the blanks.
So, 5 and 6 can go in all 3 balls.
020 NUMINO Teacher s Guide
02Unit Find the Red Ball
jOb ective Compare 3-digit numbers.
1. Textbook Instructions UNIT
Have students compare the given 3-digit 02 Find the Red Ball
numbers and find common numbers that can
go in all of the blanks. Find all the possible numbers that can go into all three red balls.
Let’s compare 693 and 89. 693 89
What is the greatest number that can go in 76 763
the blank? Six. 257 29
What are the possible numbers that can
go in the blank? One, two, three, four, and
five.
What number do you get when you put six
in the blank? Six hundred eighty nine.
Which place values do you compare when
you compare the number with 693? The
tens place.
Compare 693 and 689. Can six go in the
blank? Yes.
Let’s compare 76 and 763. Which place
values do you compare? The ones place.
What number can go in the blank?
A number that is bigger than three. Explain why you think so.
What numbers can go in the blank? Numbers 1 to 6 can go in the first blank.
Numbers 4 to 9 can go in the second blank.
Four, five, six, seven, eight, and nine. Numbers 5 to 9 can go in the third blank.
Therefore, 5 and 6 can go in all 3 blanks.
Refer to .
12
2. Build Understanding
693 89 The number in the hundreds must be less than six. So, one, two, three, four, or five can go in the blank. If you
use six, the two numbers in the hundreds place will be equal, so you have to compare the numbers in the
tens place. Eight is smaller than nine, so the sentence will still be true even if you use six in the hundreds.
76 763 The numbers in the hundreds and tens are equal, so compare the numbers in the ones. The number must be
bigger than three, so you can use four, five, six, seven, eight, or nine.
257 2 9 The number in the tens must be bigger than five. So you can use six, seven, eight, or nine. If you want to use
five, the numbers in the hundreds and tens will be equal, so you have to compare the numbers in the ones.
Seven is smaller than nine, so you can use five in the tens place. So, five and six can go in all the blanks.
So, 5 and 6 can go in all 3 balls.
020 NUMINO Teacher s Guide
