An overview of online resources for math class

There are many websites with resources you can use during math lessons. Think of an online abacus, a number line, or a die. These pages are mainly in English. Here is an overview with links to some online math resources for math lessons.

Some educational resources

How many

How Many displays a series of images. The question is always “how many?” Of course, students can count the images. But do they also see a pattern that allows them to count or calculate in groups? By clicking one of the buttons in the top left corner, you refresh the screen and determine approximately how many images appear.

Number Cards

On this number line, the number cards are presented in a five-part structure: cards 1 through 5 are red, 6 through 10 are white, and so on. When you click on a card, the number is revealed or hidden. Click directly below a card to display a yellow arrow—this way, you can indicate which card you’re discussing.

Point to a card and ask the students to tell their neighbor what number it is and how they know. You’ll notice that some children count all the cards, while others use the five-structure. You can build on this. Remove all the numbers and, for example, first point to the fifth card. Discuss this, and then point to the seventh card (leaving the five visible). Ask how the students know that it is seven.

You can also show a different part of the number line. Move the number line to the center, click on card 59 so that all students see that it is card 59. Place the arrow under card 71 and ask: what number is on this card? Ask how they know that. Some students have counted further, others have used the five- or ten-unit structure. Perhaps some students have done it differently.

Choose the range of the number line: 20 cards when you first introduce the number line. If the students have already worked with this, you can move to 50 or 100 cards. Slide the number line to the left or right to see a different section—there are always 20 cards visible at a time.

Friends of Ten

Friends of Ten is a game in which students must find two balls that together have a value of ten. Have the children find combinations that make ten. If they can’t find any more combinations, they can, of course, convince you that they’ve found all the combinations. Reload the game in the browser to play it again (with a different combination of balls).

Flashcards with the abacus

Flashcards briefly displays an abacus. The question is, "How many did you see? How did you see that so quickly?"
There are five sets of cards. If you click on one of the sets in the top left corner, the stack of flashcards will be shuffled. The red border indicates which set of cards is being used.
If you click the Show/Hide button, the flashcard is displayed. A second click shows the question "how many?" again.
The Next button briefly displays the next flashcard. The default time is 3 seconds. You can display the flashcard again by clicking the Show/Hide button.
You can shorten or extend the time by entering a different number in the top-right corner. The new time is only set after you click the Change Time Interval button. If you set the duration to 0, the card remains visible.

External online resources

Number rack

You can find a number rack at apps.mathlearningcenter.org/number-rack. This video shows how this app works: youtube.com/watch?v=1sIiTHZOKMc.

Number line

You can find a digital number line at apps.mathlearningcenter.org/number-line. This video shows how this app works: youtube.com/watch?v=bBLtvW4XeOo.

Dice

You can find a virtual die at didax.com/apps/dice. This video shows how this app works: youtu.be/NmalCiJVZD0.

Geoboard

You can find a geoboard at apps.mathlearningcenter.org/geoboard. This video shows how this app works: youtube.com/watch?v=385cN3paZQM.

Surface model for multiplication

An interactive applet for multiplication can be found at apps.mathlearningcenter.org/partial-product-finder.

Clock

You can find an interactive clock at apps.mathlearningcenter.org/math-clock.