Say the number as hundreds plus tens plus ones.

How to Play Expanded form

1. 1

   Watch

   Watch. Say the number as hundreds plus tens plus ones. 472 is 400 + 70 + 2. Then 405 is 400 + 5. Then 830 is 800 + 30.

2. 2

   Try it

   Try it. Drag the piece onto the sum. Build 472: 400, then 70, then 2. A miss shakes the card. The hearts stay hidden until the pieces are right.

3. 3

   Expanded form

   Expanded form. Drag the piece onto the sum. Six numbers. Some skip a zero, like 405 as 400 + 5, or 830 as 800 + 30.

4. 4

   Score

   A right drop adds Score and Streak. A wrong drop clears the Streak and costs a heart. Three misses and the run is Done. Again starts over. Best is saved. Sound and Mute sit on the bar. A higher Score is a New best.

Key Features

• Say the number as hundreds plus tens plus ones.

  Watch. 472 is 400 + 70 + 2. Then 405 and 830. Try it. Drag the piece onto the sum.

• A zero place is left out

  405 is 400 + 5. There is no tens piece. 830 is 800 + 30. There is no ones piece. Drag the piece onto the sum.

• Score and Streak

  Score and Streak wait until after Watch and Try it. A right drop adds Score and grows the Streak. A wrong drop shakes the card, clears the Streak, and costs a heart. Three misses and the run is Done.

• Best

  Best is kept on this device. A higher Score at the end is a New best. Again starts a new run. Sound and Mute sit on the bar.

What is Expanded form?

Expanded form is a 2nd grade game. Say the number as hundreds plus tens plus ones. Watch 472, 405, and 830. Try it. Drag the piece onto the sum. 472 is 400 + 70 + 2. 405 is 400 + 5.

Why Play Expanded form?

• 1

  The pieces of the number

  Say the number as hundreds plus tens plus ones. Drag the piece onto the sum.

• 2

  A zero is not a piece

  405 is 400 + 5. 830 is 800 + 30. The zero place is left out of the sum.

• 3

  A miss you can feel

  A wrong drop shakes the card and clears the Streak. A right drop adds Score.

Frequently Asked Questions