지도서 · Part 2–3 · 2 / 4

Compare numbers두 수 비교하기와 <, >, = 기호

Tens first, then ones. The mouth opens to the greater number.

Step 13워크북 3–4쪽 →
한국어 요약

두 수를 비교할 때 십의 자리를 먼저, 같으면 일의 자리를 보는 순서와 <, >, = 기호를 영어로 가르쳐요. 58과 85처럼 숫자만 자리가 바뀐 수, tens와 ones가 섞인 비교, 한쪽이 식인 비교도 함께 다뤄요.

이 주제의 단어number linetensonessumcompare
이 주제 차례 (9)

The big idea핵심

To compare two numbers, look at the tens first. If the tens are the same, look at the ones. On a number line, the number further to the right is greater.

We use three signs: > greater than, < less than, = equal to. The open mouth of the sign faces the greater number.

Sometimes one side is not a plain number: 4 tens and 12 ones, or 50 + 6. Change it into a plain number first. Then compare.

40414243444546474849505152
48 is further right. 48 > 43

Get ready준비물

  • Tens and ones (Lego towers and bricks)
  • A number line from 0 to 100, or a 100 square
  • Three cards with <, > and = on them

Teach it, step by step단계별 수업

YOU 부모가 할 말LIA 아이가 할 만한 대답DO 손으로 할 일

Tens first, then ones

YOU“Which is greater, 72 or 68?”
LIA72.
YOU“How do you know?”
LIA7 tens is more than 6 tens.
YOU“Now 54 or 57? The tens are the same. What do we look at next?”
LIAThe ones. 57 is greater.

The number line

DOPoint to 43 and 48 on the number line.
YOU“Which one is further to the right?”
LIA48.
YOU“Numbers get greater as we go right. So 48 is greater than 43.”

The signs

YOU“This sign is greater than. This sign is less than. This one is equal to.”
YOU“The open mouth faces the greater number. It wants the bigger number!”
DOWrite 71 and 17. Let Lia put the right card between them.
YOU“Read it to me.”
LIA71 is greater than 17.

Always read the sentence aloud from left to right. This is how Lia learns which sign is which.

Same digits, different places

YOU“58 and 85 have the same digits. Are they the same number?”
LIANo. 85 has 8 tens. 58 has 5 tens.
YOU“Yes. The place of a digit changes its value. 58 is less than 85.”

Change it first

YOU“Which is greater: 3 tens, or 25 ones?”
LIA25 ones?
YOU“Let's change them. 3 tens is 30. 25 ones is 25. Which is greater now?”
LIA3 tens!
YOU“And 70 + 6, or 78? Work out the sum first.”
LIA70 + 6 is 76. 76 is less than 78.

Show the tens and ones with bricks. 10 ones can be swapped for 1 ten.

광고

Other ways to say it다른 표현

  • “Which number is greater?”
  • “Which number is smaller?”
  • “Which number is less?”
  • “Is 71 more than 17?”
  • “Is it bigger or smaller?”
  • “Which sign goes in the circle?”
  • “Which number is further along the number line?”

Worksheet English표현

  • “Write <, > or = to compare the numbers.”
  • “Write the missing phrase.”
  • “Complete the sentences.”
  • “Circle the numbers on the number line.”

Good questions to ask좋은 질문

  • “Which place did you look at first? Why?”

    Good answers

    “The tens, because tens are worth more.”

  • “How can you check with a number line?”

    Note

    The greater number is further to the right.

  • “Is 4 tens and 12 ones the same as 52?”

    Note

    4 tens and 12 ones = 5 tens and 2 ones = 52. Yes.

  • “Can you read the sentence with the sign?”

    Good answers

    “71 is greater than 17.”

If Lia is stuck막힐 때

  • When

    Lia writes the sign the wrong way round.

    Ask her to read the sentence aloud. “Does it say 28 is greater than 82? Is that true?” Then: “The mouth eats the bigger number.”

  • When

    She thinks 58 and 85 are equal because they have the same digits.

    Build both with bricks. “How many tens here? How many tens there?”

  • When

    She compares 3 tens and 25 ones by looking at 3 and 25.

    “What is 3 tens? Say it as a number.” Change both sides into numbers, then compare.

  • When

    She compares 70 + 6 with 78 by looking only at 70.

    “Work out the sum first. What is 70 + 6?”

Game놀이

Game · Greater or less?

You need: digit cards 0–9 (or playing cards Ace to 9)

  1. Each player takes two cards and makes a 2-digit number.
  2. Say your number. Then compare in a sentence: “71 is greater than 46.”
  3. Swap the two digits. What happens? “17 is less than 46.”

Extra challenge더 도전

  • Which is greater: 6 tens and 15 ones, or 7 tens and 2 ones?
  • Make the greatest and the smallest 2-digit numbers with the digits 3 and 8.
In the workbook

Number lines, < > = signs, numbers with swapped digits, tens and ones, sums, and number words.

워크북 3–4쪽 보기이 주제 인쇄

자주 묻는 질문

<와 >는 영어로 어떻게 읽어요?

>는 greater than, <는 less than, =는 equal to라고 읽어요. 왼쪽에서 오른쪽으로 “71 is greater than 17”처럼 문장으로 읽어요.

한쪽이 식이면 어떻게 비교해요?

식을 먼저 계산해 수 하나로 만든 뒤 비교해요. 70 + 6은 76이라서 78보다 작아요.

광고