지도서 · Part 7 · 8 / 9

Add to the next 10 and across a 10다음 10의 배수까지, 10 넘어 더하기

48 + 5 = 48 + 2 + 3 = 53.

Step 8워크북 14쪽 →고침 2026.10.31
한국어 요약

10, 20, 30처럼 꽉 찬 10만 있는 수를 영어로 'multiple of 10'(10의 배수, 한국 1학년의 몇십)이라고 하는 것과, 주어진 수 다음의 10의 배수 찾기(46 다음은 50)를 가르쳐요. 그다음 48 + 5처럼 두 자리 수에 한 자리 수를 더할 때 다음 10의 배수까지 먼저 가고 남은 수를 더하는 방법을 수판, 수직선, 십 모형으로 보여 줘요.

이 주제의 단어multiple of 10
이 주제 차례 (8)

The big idea핵심

A multiple of 10 is a number we say when we count in tens from 0: 10, 20, 30 … 100. It is made of full tens and zero ones. That is why it ends in 0. 46 is not a multiple of 10: it has 4 tens and 6 ones.

The next multiple of 10 after 46 is 50. It is the next full ten, not the next number (47). 46 is between 40 and 50. If a number is already a multiple of 10, the next one is 10 more: after 60 comes 70.

This helps with bigger adding. For 48 + 5: the next multiple of 10 is 50. 48 needs 2 more. So split 5 into 2 and 3. 48 + 2 = 50. Then 50 + 3 = 53. The 2 ones and the 8 ones make a new ten. This is Part 6 (make 10) with bigger numbers.

27 + 3 = 30: three full frames, zero ones
404650
46 is between 40 and 50. The next multiple of 10 is 50.
+
48 + 5: 2 ones fill the ten, then 3 more
484950515253+2+3
jump to the next multiple of 10, then jump the rest

Get ready준비물

  • Ten frames (draw a few grids of 2 × 5) and about 30 counters
  • Base 10 blocks — or make them: bundles of 10 straws with a rubber band, and single straws
  • A number line 0–100, or a ruler

Teach it, step by step단계별 수업

YOU 부모가 할 말CHILD 아이가 할 만한 대답DO 손으로 할 일

Fill the frames

DOPut 17 counters in ten frames: one full frame and 7 in the next.
YOU“Add 3. How many now?”
CHILD20. Two frames are full.
DODo the same with 27 + 3.
YOU“What do you notice?”
CHILDEvery frame is full. There are zero ones.
YOU“10, 20 and 30 are called multiples of 10.”

Let Lia see and say it first. Give the name after.

The next multiple of 10

DOPoint to 46 on the number line.
YOU“What is the next multiple of 10 after 46?”
CHILD50.
YOU“How do you know?”
CHILD46 is between 40 and 50. 50 is the next full ten.
YOU“What about 60? What is the next multiple of 10 after 60?”
CHILD70. 60 is already a multiple of 10.

Add across a 10

DOShow 48 with base 10 blocks: 4 tens and 8 ones. Put 5 ones to the side.
YOU“We add 5. What is the next multiple of 10?”
CHILD50. 48 needs 2 more.
YOU“So split 5 into 2 and 3.”
DOMove 2 ones. Now there are 10 ones: swap them for a ten.
YOU“Now we have 5 tens. Add the 3 ones.”
CHILD53. 5 tens and 3 ones.

The moment 10 ones become one ten is the key idea. Let Lia do the swap herself.

How many to the next 10?

YOU“72 + □ = 80. What is the missing number?”
CHILD8.
YOU“How do you know?”
CHILD2 + 8 = 10, so 72 + 8 = 80.

Look at the ones. A bond to 10 gives the answer.

광고

Other ways to say it다른 표현

  • “What is the next multiple of 10?”
  • “What is the next full ten?”
  • “Which two multiples of 10 is it between?”
  • “How many to the next 10?”
  • “Add to the next 10, then add the rest.”
  • “Ten ones make a new ten.”
  • “Split the 5 into 2 and 3.”
  • “Add across a 10.”

Good questions to ask좋은 질문

  • “Is 46 a multiple of 10? How do you know?”

    Good answers

    “No. It has 6 ones.”

  • “What is the next multiple of 10 after 95?”

    Note

    100. Ten tens make 100.

  • “Why is 47 not the next multiple of 10 after 46?”

    Good answers

    “47 is the next number. It still has ones.”

  • “Can you do 36 + 7 by going to 40 first?”

    Note

    36 needs 4: split 7 into 4 and 3. 40 + 3 = 43.

If Lia is stuck막힐 때

  • When

    She says the next number: “After 46 comes 47.”

    “47 is the next number. Is it a full ten? Show me with ten frames.” Fill the frame to 50.

  • When

    She goes back: “The next multiple of 10 after 21 is 20.”

    “20 is before 21. Next means after.” Point to 20, 21 and 30 on the number line.

  • When

    She loses the new ten: 36 + 7 = 33.

    “6 and 7 make 13 ones. 13 ones are one ten and 3 ones. Where does the ten go?” Swap 10 cubes for a ten.

Game놀이

Game · Next ten, please!

You need: a number line 0–100 (or a ruler), or nothing at all

  1. One player says a number up to 99: “64.”
  2. The other says the next multiple of 10 and how many to get there: “70. 6 more.”
  3. Check together with a bond to 10 (4 + 6 = 10). Then swap.

Extra challenge더 도전

  • The previous multiple of 10: before 46 comes 40.
  • Two steps across 100: 97 + 5 = 97 + 3 + 2 = 102.
  • Take away to a multiple of 10: 53 − 3 = 50. Then 53 − 5 = 53 − 3 − 2 = 48.
In the workbook

Find the next multiple of 10, add across a 10 with base 10 blocks, missing numbers and a cupcake story.

워크북 14쪽 보기이 주제 인쇄

자주 묻는 질문

multiple of 10이 뭔가요?

10씩 세면 닿는 수예요. 10, 20, 30처럼 일의 자리가 0이에요. 한국어로는 10의 배수, 몇십이라고 해요.

37 다음의 10의 배수는 38인가요?

아니에요. 38은 37 다음 수예요. 37 다음의 10의 배수는 40이에요. 수직선에서 37 다음에 오는 몇십을 찾아요.

35 + 8을 33이라고 하면요?

일의 자리 5 + 8 = 13에서 새 10을 놓쳤어요. 8을 5와 3으로 나눠 먼저 40을 만들고 3을 더하면 43이에요.

광고