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Number Trail Grade 2 / Week 09 / Monday
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Week 09 · Add and subtract to 1000

Monday

Add hundreds, tens and ones
// Hundreds with hundreds, tens with tens, ones with ones
⏱ about 15 min

Monday: Add hundreds, tens and ones

Rosie the Rabbit hops up the trail with a full basket.

"I picked 234 berries!" she says.

Bennie the Bear has 152 berries in his basket.

"Let us put them together," says Bennie.

Rosie claps her paws. "How many berries do we have in all?"

"We can add one place at a time," Bennie says.

Learn it: one place at a time

Here is 234. It is 2 hundreds, 3 tens and 4 ones.

Base-ten blocks: 2 hundreds, 3 tens and 4 ones

Here is 152. It is 1 hundred, 5 tens and 2 ones.

Base-ten blocks: 1 hundreds, 5 tens and 2 ones

Bennie adds the ones first. 4 plus 2 is 6 ones.

Next he adds the tens. 3 tens plus 5 tens is 8 tens.

Then he adds the hundreds. 2 hundreds plus 1 hundred is 3 hundreds.

So 234 plus 152 is 386.

Base-ten blocks: 3 hundreds, 8 tens and 6 ones
WHAT NUMBER DO THE BLOCKS SHOW?
  • Read the question.
  • Tap your answer.
Base-ten blocks: 3 hundreds, 4 tens and 2 onesWhat number do the blocks show?
Base-ten blocks: 1 hundreds, 2 tens and 5 onesWhat number do the blocks show?
Base-ten blocks: 4 hundreds, 0 tens and 6 onesWhat number do the blocks show?
Base-ten blocks: 2 hundreds, 6 tens and 0 onesWhat number do the blocks show?

Add each place

Line up the places. Add ones, then tens, then hundreds.

FIND THE SUM
  • Read the question.
  • Tap your answer.
321 + 456 = ?
142 + 235 = ?
Base-ten blocks: 5 hundreds, 0 tens and 3 ones503 + 264 = ?
610 + 125 = ?
Number sentenceTrue or false?
200 + 300 = 500?
140 + 220 = 360?
315 + 111 = 416?
432 + 105 = 537?
WHY THIS EXERCISE315 plus 111 is 426, not 416. Check the tens.
PUT THE SUMS IN ORDER, SMALLEST FIRST
  • Look at the hundreds first.
  • Tap the numbers from smallest to biggest.
11st
22nd
33rd
44th
STORY PROBLEMS
  • Read the question.
  • Tap your answer.
Rosie has 213 shells. Bennie has 164 shells. How many in all?
There are 120 ducks on the pond. Then 50 more come. How many now?
Bennie stacks 400 stones. Then he stacks 300 more. How many stones now?
Try it
Get paper and a pencil.
Make a big square for each hundred.
Make a line for each ten. Make a dot for each one.
Show 234 this way. Then show 152.
Draw 386 with squares, lines and dots.

Word Spot: these, those

Here are new sight words.

Look at each word. Say it. Spell it.

These: T-H-E-S-E.

Those: T-H-O-S-E.

FIND THE WORD
  • Listen to the word.
  • Tap it.
Find the word you hear.
Find the word you hear.
Find the word you hear.
Find the word you hear.
FILL THE GAP
  • Listen to the sentence.
  • Tap the missing word.
Look at ___ leaves.
___ clouds are big and gray.

Great adding! Tomorrow we subtract big numbers.