Primary Resources
Primary Resources: Doubling and Halving
Great teacher resources for helping students learn how to double or halve numbers quickly. Includes worksheets, PowerPoint presentations, and classroom games.
Ministry of Education and Employment of Spain
Red Escolar: Problemas De Holmes 2002
In Spanish. Practice your mental math skills with this site. You will find different activities for every month of the year. Different levels of difficulty and suggested time limit for each activity are also provided.
Instituto Latinoamericano de la Comunicacion Educativa
Red Escolar: Problemas De Holmes 2006
In Spanish. Practice your mental math skills with this site. You will find different activities for every month of the year. Different levels of difficulty and suggested time limit for each activity are also provided.
Instituto Latinoamericano de la Comunicacion Educativa
Red Escolar: Problemas De Holmes 2003
In Spanish. Practice your mental math skills with this site. You will find different activities for every month of the year. Different levels of difficulty and suggested time limit for each activity are also provided.
Instituto Latinoamericano de la Comunicacion Educativa
Red Escolar: Problemas De Holmes 2004
In Spanish. Practice your mental math skills with this site. You will find different activities for every month of the year. Different levels of difficulty and suggested time limit for each activity are also provided.
Can Teach
Can Teach: Who Has More or Less?
Want to practice addition and subtraction skills in a new and exciting way? Use this online math lesson card game activity.
Ministry of Education and Universities of the Region of Murcia (Spain)
Ministerio De Educacion Y Ciencia: Figuras Magicas
In Spanish. This site contains many games for practicing mental numerical calculation of basic operations.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: The Meaning of Subtraction, and Mental Calculation
This website explains and defines basic subtraction. There are practice problems at the very end of this lesson.
Alabama Learning Exchange
Alex: Why Do We Carry the One?
The students will critically think through the traditional algorithm for addition and compare to an alternative strategy.
Topmarks Online
Topmarks: Helicopter Rescue
A game which helps students identify and work with two-digit numbers. There are four game modes: Find a Number, Find the Number Between Count On, and Count Back. The counting on and back games reinforce the vocabulary of addition and...
Math Playground
Math Playground: Math Monster Addition
An online game where students can make monsters appear by knowing their addition facts.
Topmarks Online
Topmarks: Daily 10
Daily 10 has maths questions on a range of maths concepts: addition, subtraction, ordering, partitioning, digit values, rounding, multiplication, division, doubles, halves and fractions. Great starter or plenary activity. Useful for...
Math Slice
Math Slice: Connect 4 Game
For this game, students must click on four numbers that add to a given sum.
Topmarks Online
Topmarks: Loop Cards
Fantastic for improving your mental maths. Similar to dominoes, complete the loop against the clock while practicing addition, subtraction, multiplication, and division.
Educaplus (Jesús Peñas Cano)
Educaplus: Equilibra La Balanza Numeros Positivos Y Negativos
Practice your mental math by finding the weight of each of the fruits. You can add or subtract different weights.
Instituto Latinoamericano de la Comunicacion Educativa
Red Escolar: Un Juego Para Los Mas Pequenos
In Spanish. Practice mental addition and subtraction with this math game.
AAA Math
Aaa Math: Estimating a Sum by Rounding
Use rounding to estimate the answer to an addition problem in this online game. As you play the game, running totals of correct and incorrect answers and your score are displayed.
National Institute of Educational Technologies and Teacher Training (Spain)
Ministerio De Educacion: La Triada (Suma)
This is a game about addition of numbers from 1 to 9. A group of two players are needed for this game.
AAA Math
Aaa Math: Adding Two Digit Numbers Mentally
Read these two strategies for adding two-digit numbers in your head. Then try out the one you like better by playing the game. Running totals of your correct and incorrect answers as well as a percent score of your correct answers will...
AAA Math
Aaa Math: Adding Tens
This game helps you practice adding tens. You will get to see a percent score of the answers you have correct, as well as running totals of the answers you have correct and incorrect.
Math Slice
Math Slice: Heavy Slice Special Test
A concise test for assessing number sense using weights and scales. Assessment is scored online offering students immediate feedback. Can be used for a quick assessment.
Project Britain
Primany Homework Help: Year 3 Iq Problems A
The assessment reviews addition and subtraction facts. Students answer 10 review problems and then check their answers by clicking a button.
Khan Academy
Khan Academy: Add and Subtract Fractions Word Problems
Practice solving fraction addition and subtraction word problems. The fractions in these problems have unlike denominators. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...
Education.com
Education.com: k.oa.a.1 Worksheets
[Free Registration/Login Required] Choose from a variety of worksheets which help students practice addition and subtraction with objects, fingers, mental images, and drawings.