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Use Models and Drawings to Subtract within 1000

Students will subtract numbers within 1000 using concrete base-ten models or drawings. They will decompose hundreds and tens as needed (ungrouping) and record the result accurately.

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Use Models and Drawings to Subtract within 1000

Grade 2 · Addition and Subtraction within 1000 · question 1 of 3

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12 rungs. A star at the top.

Diego has 180 flags at the parade. He gives some away. 120 are left. How many did he give away?

How it is taught

0:00 of 4:09

Blocks show hundreds, tens, and ones.

Take away the blocks you subtract.

If you cannot take enough, regroup first.

Read it: Break a ten when the ones run short

166 − 58: there are 6 ones, and 8 must go. Break a ten into 10 ones: now 16 ones, and 8 can go. 166 − 58 = 108.

  1. Look at the ones: 6 ones, and 8 must go.
  2. Break 1 ten into 10 ones: 1 hundred, 5 tens and 16 ones.
  3. Take away by place: 16 − 8 = 8 ones, 5 − 5 = 0 tens, 1 hundred. 108.

A ten is the same as 10 ones, so breaking it does not change how many there are.

Now there are enough ones to take 8.

Check by adding back: 108 + 58 = 166.

When a place runs short, break 1 of the next place into 10.

Taking 6 from 8 instead, because 8 − 6 is easy.

8 ones must go, and there are only 6. Break a ten first: 16 − 8 = 8. 166 − 58 = 108.

223 − 14 = ___ — 209. 4 ones must go, and there are only 3 ones loose. Break 1 rod into 10 ones. The same number, grouped differently: 1 rod and 13 ones. Take 14 away: 223 − 14 = 209.

234 − 152

Today we'll subtract two hundred thirty-four minus one hundred fifty-two, using place-value blocks.

Two hundred thirty-four is 2 hundreds, 3 tens, and 4 ones.

We want to take away 1 hundred, 5 tens, and 2 ones.

234 − 152 = ?HundredsTensOnes■■▮▮▮▮▮▮▮▮▮▮▮▮▮●●●●✗✗✗✗✗✗✗✗✗234−152113280ANSWER82234 − 152
Grade 2 · Subtract with place-value blocks (one ungroup)

Start with the ones. Four take away two is two.

Now the tens. Three take away five — uh oh, we don't have enough tens!

So we ungroup. Break one hundred into ten tens.

Now we have thirteen tens. Thirteen minus five is eight.

One hundred is left. One minus one is zero.

Two hundred thirty-four minus one hundred fifty-two is eighty-two!

What you see

While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.

MayaGrade 3 · Mathematics
Did you know?

A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.

Today’s goal
1 star — one skill mastered, every rung of its ladder climbed
Climbing now
Divide within 100

An example student.

MayaGrade 3 · Mathematics

Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.

An example week.

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