Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions (e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.)
There are 29 videos in this category and 59 videos in 28 subcategories.
Category Videos

Not Right For WatchKnowLearn
Ages: 3  7
8310 Views:

In this video snippet from "Sesame Street", Elmo sings about his 4 ducks. During each verse of the song, one duck at a time leaves, allowing the viewer to tell how many ducks are left. This would be a great song for introducing subtraction to very yo...ung children. (02:04)
[more]
July 25, 2009 at 10:59 AM


Not Right For WatchKnowLearn
Ages: 3  8
7287 Views:

A song about 5 red apples in a tree. The song is similar to 5 little monkeys and introduces the idea of subtraction. Run time 01:47.
September 24, 2010 at 04:23 PM


Not Right For WatchKnowLearn
Ages: 4  7
7979 Views:

Students learn to write fact family problems. Fact families all use the same number. Using a whole, part, part mat, students use cube trains to write two different addition problems using the same numbers 2, 8 and 10 (2+8=10, 8+2=10). For the subt...raction problems, students use the same cube trains but start with the whole (10) and then break it down into the two parts (2, 8). Write the subtraction sentences with the same numbers 2, 8 and 10 (108=2, 102=8).
[more]
May 14, 2010 at 01:29 PM


Not Right For WatchKnowLearn
Ages: 3  7
4839 Views:

A cartoon peacock demonstrates subtraction when he loses tail feathers. He begins with 5 feathers and loses them one by one. The number sentence presented each time a disaster takes away one of the tail feathers. (00:52)
July 13, 2009 at 01:42 PM


Not Right For WatchKnowLearn
Ages: 3  7
3128 Views:

This short, animated video uses light bulbs to demonstrate subtraction. Light bulbs are taken away one at a time until none are left.
August 6, 2009 at 05:40 PM


Not Right For WatchKnowLearn
Ages: 6  9
2471 Views:

Using knowledge of addition facts, students will learn how to use related facts or fact families to solve the problem. Related facts or fact families, use the same 3 numbers. User clicks through the slides.
May 20, 2010 at 02:15 PM


Not Right For WatchKnowLearn
Ages: 5  11
8081 Views:

A fact family uses the same three numbers to make addition and subtraction problems such as 7+2=9, 2+7=9, 92=7, 97=2.
May 20, 2010 at 01:59 PM


Not Right For WatchKnowLearn
Ages: 4  10
4558 Views:

This virtual manipulative abacus allows children to explore other representations of numbers. (It uses a Java applet).
May 9, 2010 at 09:54 AM


Not Right For WatchKnowLearn
Ages: 3  6
3973 Views:

This Sesame Street subtraction rhyme starts with 8 spiders. One by one, the spiders are subtracted leaving only one at the end. Shows the strategy of "take away one and count the remaining objects." (1:11)
August 6, 2009 at 06:09 PM


Not Right For WatchKnowLearn
Ages: 4  7
3425 Views:

Using counters, students will learn how to write a subtraction problem and determine the answer. Count the objects in the whole group, cross out to take away and write how many are left. 9  4.
May 14, 2010 at 01:03 PM
