Harcourt Multimedia Math Glossary
http://www.harcourtschool.com/glossary/math2/index_temp.html
A glossary that includes definitions and examples for common and uncommon math words. Click on your grade level to begin.

Activities for Your Day
http://www.illuminations.nctm.org/swr/review.asp?SWR=1919#
This site, sponsored by the US Department of Education, recommends many math activities that parents can utilize no matter how busy their days are.

The World of Aunty Math
http://www.dupagechildrensmuseum.org/aunty/index.html
Aunty Math creates challenging word problems for children each month. Her problems center around young friends who come to visit her with mathematical puzzles or events that are constructed into problems.

Count Us In 10
http://www.abc.net.au/countusin/games/game10.htm
Estimate volumes of containers of water.

Measurement with Integer Bars
http://mathforum.org/varnelle/measure.html
Create a picture and use integer bars as a nonstandard tool to measure length.

Two Kinds of Time
http://nlvm.usu.edu/en/nav/frames_asid_316_g_1_t_4.html
Students compare time on an analog clock to a digital clock.

Varnelle's Primary Math - Intro to Measurement
http://Illuminations.nctm.org/swr/review.asp?SWR=520
This unit introduces young children (K-2) to beginning concepts in measurement: building houses, short vs. tall, brick walls, designing bridges, and measurement using non-standard units. Each lesson includes an interactive applet with screen-based pictures of the manipulatives, paper/pencil practice, and literature connections.

Count Us In 15
http://www.abc.net.au/countusin/games/game15.htm
Estimate volumes of containers of water.

Shape Pan Balance
http://Illuminations.nctm.org/mathlets/shapebalance/index.html
Use shapes to learn about weight and making the balance equal.

Properties of Numbers Using Calculators and Hundred Boards
http://standards.nctm.org/document/eexamples/chap4/4.5/index.htm
The task is to compare counting sequences on your calculator with the patterns they generate on the hundred board.

Chip Abacus
http://nlvm.usu.edu/en/nav/frames_asid_209_g_1_t_1.html?open=activities
Learn about carrying and digits using chips.

Base Ten Blocks
http://Illuminations.nctm.org/swr/review.asp?SWR=1530
Students can select any combination of three different block sizes (representing a unit, 10 units, and 100 units) and drag them into the working panel. Students can then move, rotate, break, and glue the blocks to explore base 10 place value.