Homework - addition

The homework this week is to explain what you know about addition.

Some ideas:

• How do you add numbers? Are there any written methods that help you?
• What about adding negative numbers, decimals or fractions?
• What's the biggest number you can add?
• When do you use adding in everyday life?
• Are there any jobs where you need to be really good at adding? Why?
• What happens if you add two even numbers? What about three even numbers? etc. What about odd numbers?

Space Maths

This term we are going on a space exploration in maths. We have designed space ships and are going to lots of different planets.

Click here to do some Spacey Maths and practice adding, subtracting, multiplying and dividing.

Adding

This is a great website to practise mental addition:

http://funschool.kaboose.com/formula-fusion/games/game_addition_attack.html

This is a robot adding game:

http://funschool.kaboose.com/formula-fusion/number-fun/games/game_dr_brains_robot.html

Another fun adding game:

http://funschool.kaboose.com/formula-fusion/number-fun/games/game_cannon_math.html

Mental addition

This week we are practising adding and subtracting mentally. There are several strategies that can be used.

Adding a one-digit number to a two-digit number:

Method 1. Counting on. Eg. 23 + 4 = ? Count up 4 from 23, say 24, 25, 26, 27 (don't say starting number as nothing has yet been added!)

Method 2. Adding on. Eg. 23 + 4 = ? Knowing that 3 + 4 = 7 therefore 23 + 4 = 27

Method 3. Adding on when answer goes beyond next 10. Eg. 23 + 8 = ? Add on 7 to make it up to 30 then add on 1 to make 31


Adding a two-digit number to a two-digit number:

Method 1. Adding 10s then 1s. Eg. 23 + 25 = ? First add 10s, 20 + 20 = 40, then add 1s, 3 + 5 = 8, then add together, 40 + 8 = 48

Method 2. Adding on 10s then 1s. Eg. 25 + 17 = ? Add 10 onto 25 = 35, then add on 7 using methed 3 from above.


This website lets you practise adding two-digit numbers (select level 3):
http://www.crickweb.co.uk/assets/resources/flash.php?&file=digitmenu


Practise adding one-digit and two-digit numbers at this website (select adding and medium level):
http://www.mrnussbaum.com/mayan-math/index.html