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Each game has 10 questions.

Green box means correct.

Yellow box means incorrect.

Unlock harder levels by getting an average of 80% or higher.

Earn up to 5 stars for each level

The more questions you answer correctly, the more stars you'll unlock!

Each game has 10 questions.

Green box means correct.

Yellow box means incorrect.

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Grade 2 - Number Sense and Numeration

Standard 2.NSN.1 - Understand the place values of tens and ones. Convert numbers into tens and ones to solve.

Included Skills:

Quantity Relationships

• represent, compare, and order whole numbers to 100, including money amounts to 100�, using a variety of tools (e.g., ten frames, base ten materials, coin manipulatives, number lines, hundreds charts and hundreds carpets);

• read and print in words whole numbers to twenty, using meaningful contexts (e.g., storybooks, posters, signs);

• compose and decompose two-digit numbers in a variety of ways, using concrete materials (e.g., place 42 counters on ten frames to show 4 tens and 2 ones; compose 37� using one quarter, one dime, and two pennies) (Sample problem: Use base ten blocks to show 60 in different ways.);

• determine, using concrete materials, the ten that is nearest to a given two-digit number, and justify the answer (e.g., use counters on ten frames to determine that 47 is closer to 50 than to 40);

• determine, through investigation using concrete materials, the relationship between the number of fractional parts of a whole and the size of the fractional parts (e.g., a paper plate divided into fourths has larger parts than a paper plate divided into eighths) (Sample problem: Use paper squares to show which is bigger, one half of a square or one fourth of a square.);

• regroup fractional parts into wholes, using concrete materials (e.g., combine nine fourths to form two wholes and one fourth);

• compare fractions using concrete materials, without using standard fractional notation (e.g., use fraction pieces to show that three fourths are bigger than one half, but smaller than one whole);

• estimate, count, and represent (using the � symbol) the value of a collection of coins with a maximum value of one dollar.

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