Operations on whole numbers

Mina's class collects 368 cans to recycle.
Will's class collects 254 cans.
How many hundreds are there in all?

• 500
• 300
• 200
• 400

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CCSS.2.NBT.B.7

Find the missing numbe

2 hundreds + 50 tens = ____ hundreds

• 205

• 52

• 7

• 250

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CCSS.2.NBT.B.7

Choose the expression that is equal to 83. 

• 383 $-$  300

• 200 $-$ 100

• 183 $-$ 297

Answer explanation

Remember, when subtracting, mathematicians may need to unbundle a larger unit to get more of a smaller unit.

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CCSS.2.NBT.B.7

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CCSS.2.NBT.B.7

Work out. Aħdem.

220+

219 .

________

________

• 439

• 449

• 539

• 549

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CCSS.2.NBT.B.7

Look at the number sentence. Which number is the sum?

• 72

• 45

• 27

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CCSS.2.NBT.B.7

Let's try another.

What do we do first ?

• Write the numbers in expanded form.

• Add the ones place.

• Write the numbers in standard form.

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CCSS.2.NBT.B.7

56 snakes - 31 snakes =

• 25 snakes

• 20 snakes

• 15 snakes

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CCSS.2.NBT.B.7

• Add

• Subtract

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CCSS.2.NBT.B.7

..74

+ 3

______

• 67

• 76

• 77

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CCSS.2.NBT.B.7