This interactive Flash puzzle helps children develop number sense and an understanding of our decimal number system. A 0-99 square has been cut into 11 irregular pieces which the user re-assembles. A printable (pdf) version is included along with questions for Getting Started and a Teachers' Resources page with implementation suggestions.

The focus of the Accurate Counting intervention is counting known quantities with one-to-one correspondence. This intervention works on counting up to ten objects or pictures that are in a straight line.

Have several sets of 5 interlocking cubes, legos, or blocks with 2 different colors.  Talk about how you are holding 5 objects, but you can take them apart by color as you count the amounts in each section.  For example, 1 red block and 4 yellow blocks.  When they have all been taken apart, you can put them back together.  Help your child(ren) discover how two different colored objects can be put together to make 5.  

This page provides a problem solving resource for teachers to use with their students in the days leading up to Christmas. Twenty-four math problems from the NRICH collection have been included in this advent problem set based on the theme of Planet Earth; each problem includes teacher resources, a printable page, and a solution

In this card game students play in pairs to practice recognizing the biggest number.

This problem provides an opportunity for students to develop problem solving skills while applying skip-counting and exploring the concepts of multiples and factors within 20. It is posed in the context of toppings on cookies ("biscuits" in the UK) and lends itself to multiple representations. The Teachers' Notes page offers suggestions for implementation, discussion questions, ideas for extension and support, and downloadable handouts.

This problem promotes logical thinking and introduces learners to the trial and error (guess and check) problem solving strategy, especially with the interactive provided. In this problem children need to understand the difference between having a certain number of brothers and the number of boys in a family to answer the question, "How many children are there in the Brown family?" The Teachers' Notes page offers suggestions for implementation, discussion questions, ideas for extension and support, and a link to a down loadable worksheet for students to table their trials.

This three-act math task utilizes videos and questioning to help students explore counting and joining sets.

Teachers (and then students) lead the class in chanting numbers from 1 to 120.

Children will count out objects by touching the objects as they count them. Ask them to answer how many they counted. 

Students practice counting sequences by standing in a circle and counting one by one.

This three-act math task utilizes videos and questioning to help students explore counting and patterns.

The focus of the Count to Know How Many intervention has two phases. Phase 1: Count and write the number of objects up to 20 and understand that the quantitiy stays the same even if objects are moved into different shapes or line. Phase 2: Count out the requested number of objects up to 20 and write the number of objects.

Students practice crossing from one family to the next in counting forward with this concentration game.

The DREME Network was created in 2014 to advance the field of early mathematics research and improve young children’s opportunities to develop math skills. The Network focuses on math from birth through age eight years, with an emphasis on the preschool years. Network members and affiliates collaborate to conduct basic and applied research and develop innovative tools that address high-priority early math topics and inform and motivate other researchers, educators, policymakers and the public.

This problem helps learners become more familiar with odd and even numbers and addition facts within five. By challenging them to justify their findings, it also develops reasoning and communication skills. The problem displays 9 dominoes and asks the student to sort them according to parity, and then into pairs totaling 5 pips. It poses questions that stimulate thinking about basic number concepts. The Teachers' Notes page offers suggestions for implementation, discussion questions, ideas for extension and support, and a link to an interactive Dominoes Environment (cataloged separately).

This web page describes several games and puzzles that build number sense, fact and computational fluency, flexibility, and reasoning. Each activity uses an ordinary set of double-6 dominoes. After describing dominoes generally, the page provides rules for the basic domino game and a variation, and proposes several other challenges involving addition, multiplication and prime numbers. The page includes a link to an interactive Dominoes Environment (cataloged separately).

This interactive Flash applet provides a customizable set of dominoes that users can manipulate to play games or solve puzzles. It can be used with an interactive whiteboard to facilitate group work. Users can determine the size of a set (up to double-9), remove individual dominoes, rotate and move them, and change their size. The Teachers' Notes page includes a link to page containing domino games and challenges (cataloged separately).

This dice game combines practice with basic number facts with strategic thinking. Students first are challenged to determine the rules of the game by watching a video of a game being played. The game is accompanied by a Teachers' Resource page that includes suggestions for approaching the problem, questions, extension ideas, and tips for support.