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B. Number · Number Sense: Numbers to 200 and Fractions

Number Sense: Numbers to 200 and Fractions: Unit Review

B1.1 B1.2 B1.3 B1.4 B1.5 B1.6 B1.7 A1About 40 minutes
Learning goals
  • I can count, read, write, build and compare numbers to 200.
  • I can estimate big collections and tell if a number is even or odd.
  • I can solve fair-share problems and compare the shares.
  • I can explain why one third and two sixths are equal.

Words to know

place value
The value of a digit because of its place. In 162, the 6 is worth 60.
estimate
A smart guess that is close to the real number.
even / odd
Even numbers make pairs with none left over. Odd numbers have one left over.
mixed number
A whole number and a fraction together, like 2 and a half.
fraction
A number that names equal parts of a whole, like one third.

Let's review!

You have learned a lot about numbers to 200 and fractions. This review has a few questions from every lesson in the unit. Try each one, then press Show answer to check. If a part feels tricky, go back to that lesson for more practice.

Counting to 200 by 1s, 10s, 20s, 25s and 50s

1

Count by 1s: 197, 198, 199, __

2

Count by 25s from 0 to 200.

3

Count by 10s: 68, 78, 88, __, __

4

Count backward by 20s: 200, 180, __, __

Reading, Writing and Using Numbers to 200

1

Write one hundred seventy in digits.

2

Write 115 in words.

3

A sign says "Highway 400" and a bag says "150 grams". Which number is a name and which is a measurement?

Hundreds1100Tens330Ones66++136 = 100 + 30 + 6The ones digit is 6, so 136 is even.
Every digit has a value. 136 is 1 hundred, 3 tens and 6 ones: 100 + 30 + 6.

Hundreds, Tens and Ones: Building and Breaking Apart Numbers

1

What number is 1 hundred, 0 tens and 8 ones?

2

In 192, what is the 9 worth?

3

What number is 16 tens and 4 ones?

4

Write 137 in expanded form.

Comparing and Ordering Numbers to 200

1

Which is greater, 159 or 195?

2

Put in order from least to greatest: 160, 106, 116, 99

3

Name all the numbers between 128 and 132.

Estimating Big Collections

1

A cup holds about 25 beads. 6 cups are full. About how many beads?

2

You count 15 groups of 10 and 4 more. How many?

3

There are 88 leaves. Which estimate is closest: 50, 90, or 150?

Even and Odd Numbers

1

Is 15 even or odd? Explain with pairs.

2

Is 180 even or odd?

3

Name the odd numbers between 140 and 146.

Fair Sharing: Whole Numbers and Leftovers

1

Share 8 apples among 4 friends.

2

Share 7 pancakes between 2 people.

3

Share 5 sandwiches among 3 people.

4

Share 9 marbles between 2 kids.

Shares Smaller Than One: Halves, Thirds, Fourths and Sixths

1

How many fourths make one whole?

2

3 friends share 1 granola bar. How much does each get?

3

4 kids share 3 pizzas. How much does each kid get?

4

Count: one sixth, two sixths, three sixths, __

Comparing Fair Shares

1

Which is bigger, one third or one sixth of the same cake?

2

Which is more, 2 and one fourth or 2 and a half?

3

6 cookies are shared by 2 kids, and 6 cookies are shared by 3 kids. Which kids get more each?

1 whole1 wholethirdsthirdthirdthirdsixthssixthsixthsixthsixthsixthsixthone third = two sixths
One third and two sixths of the same whole end at the same place, so they are equal.

One Third and Two Sixths Are Equal

1

How many sixths equal one third of the same whole?

2

Ava has one third of a pizza. Eli has two sixths of the same size pizza. Who has more?

3

6 kids share 2 sandwiches fairly. Name each share in two ways.

Just for fun

Why did the student bring a ladder to the math review?

To help them count all the way up to 200!

How to use this review

  • Do the review over two short sittings if your child gets tired. Each section matches one lesson.
  • Let your child use tools: straws in bundles, base ten blocks, a number line, paper strips and drawings. Using tools is part of Grade 2 math.
  • After each answer, ask "How do you know?" Explaining matters as much as the answer.
  • Note which section had mistakes, then revisit that lesson's practice and activities.
Check your understanding

Quiz

1.

What comes next? 107, 108, 109, __

2.

Count by 50s: 50, 100, 150, __

3.

How do you write one hundred six in digits?

4.

Which is the same as 1 hundred, 4 tens, 3 ones?

5.

Which number is greatest?

6.

You count 11 groups of 10 and 6 more beans. How many beans?

7.

Which number is odd?

8.

Share 9 pancakes between 2 people. How much does each get?

9.

The same pie is shared fairly. Which share is smallest?

10.

Which is equal to one third of a sandwich?

For parents and teachers

Use mistakes to choose what to revisit. Each review section matches one lesson.

  • Gets stuck at 109, 119 or 199, or can't skip count by 20s, 25s or 50s: revisit Counting to 200 by 1s, 10s, 20s, 25s and 50s.
  • Writes numbers the way they sound (10060 for 160) or forgets the zero (16 for 106): revisit Reading, Writing and Using Numbers to 200.
  • Doesn't know what a digit is worth, or can't trade 10 tens for a hundred: revisit Hundreds, Tens and Ones: Building and Breaking Apart Numbers. Use bundles of straws.
  • Compares by the first digit they see (thinks 98 is more than 108) or orders incorrectly: revisit Comparing and Ordering Numbers to 200.
  • Makes wild guesses, or counts one by one to check: revisit Estimating Big Collections.
  • Mixes up even and odd, or looks at the wrong digit: revisit Even and Odd Numbers. Pair real objects.
  • Leaves leftovers that could be cut, or cuts into the wrong number of parts: revisit Fair Sharing: Whole Numbers and Leftovers.
  • Calls unequal parts "thirds", or can't share when there is less than one each: revisit Shares Smaller Than One: Halves, Thirds, Fourths and Sixths.
  • Thinks one sixth is bigger than one third, or ignores the whole number when comparing mixed numbers: revisit Comparing Fair Shares.
  • Thinks two sixths is more than one third because there are more pieces: revisit One Third and Two Sixths Are Equal. Fold paper strips and line them up.

A few mistakes are normal. Praise the strategy your child explains, not only the right answer.