This short video and interactive assessment activity is designed to teach fourth graders about multiple rounds of multiplication - multiplying 3 digits by 1 digit.

This short video and interactive assessment activity is designed to teach second graders about fluency in subtraction (numbers up to 20).

This short video and interactive assessment activity is designed to teach second graders about selecting the correct subtraction sentence.

This short video and interactive assessment activity is designed to teach second graders about addition: selecting the correct sentence.

This video and accompanying interactive assessment practice was designed to teach completing the subtraction sequence to first graders.

In this classic hands-on activity, learners estimate the length of a molecule by floating a fatty acid (oleic acid) on water. This lab asks learners to record measurements and make calculations related to volume, diameter, area, and height. Learners also convert meters into nanometers. Includes teacher and student worksheets but lacks in depth procedure information. The author suggests educators search the web for more complete lab instructions.

This task gives children an opportunity to subtract a three-digit number including a zero that requires regrouping. The solutions show how students can solve this problem before they have learned the traditional algorithm.

In this video segment from Cyberchase, Inez estimates whether she has enough jelly beans in her large container to decorate all of the cookies in her batch.

What we like about this task

Mathematically:

Addresses standards: 4.OA.A, 4.NBT.B, 4.OA.A.3, 4.NBT.B.6, MP.1, and MP.6
Requires students to understand the meaning of the quotient and remainder in order to solve problems in a real-world context
Addresses content across two major clusters (4.OA.A and 4.NBT.B) within the grade, specifically 4.OA.A.3 and 4.NBT.B.6
Requires students to interpret what is being asked and perform extensive calculations (MP.1) accurately and efficiently (MP.6)
In the classroom:

Offers opportunities for students to use strategies based on place value, properties of operations, and/or the relationship between multiplication and division to solve division problems
Provides repeated practice of multi-digit division and can be easily altered to allow for repeated use throughout the year
Allows for small group, partner, or individual work

The purpose of this task is to help students see the connection between aÖb and ab in a particular concrete example. The relationship between the division problem 3Ö8 and the fraction 3/8 is actually very subtle.

This task provides a context for performing division of a whole number by a unit fraction. This problem is a "How many groups?'' example of division.

Students play a game in pairs to read and recognize numbers using a 100 chart.

This short video and interactive assessment activity is designed to teach fourth graders about selecting the quotient using given statements.

This short video and interactive assessment activity is designed to teach fifth graders about selecting the quotient with the correct number of digits.

This is a video and assessment exercise aimed at helping first graders identify incorrect subtraction.

This short video and interactive assessment activity is designed to teach second graders about selecting the incorrect subtraction sentence (numbers up to 20).

This course features a video review and an interactive assessment activity for selecting the correct addition sequence. It is aimed at first graders.

This short video and interactive assessment activity is designed to teach second graders about selecting the correct addition sentence.