Numbers and powers of 10

"Powers of 10" is a very useful way of writing down large or small numbers. Instead of having lots of zeros, you show how many powers of 10 you need to make that many zeros. See more here.
Can you imagine what size are the things around us? Have a look to the following site called "Scale of universe enhanced" and write a brief summary with your partner of three things on the web.

Let me know what you think in the comments,
Cheers,
ALICIA

Multiplying and dividing fractions

To multiply fractions, there are three steps:

1. Multiply the top numbers (the numerators).

2. Multiply the bottom numbers (the denominators).

3. Simplify the fraction if needed.
See more about multiplication

Practice multiplying fractions

To divide fractions, follow these rules:
1. Turn the second fraction (the one you want to divide by) upside-down (this is now a reciprocal).
2. Multiply the first fraction by that reciprocal
3. Simplify the fraction (if needed)
 See more about division

Practice dividing fractions by fractions.

Play the contest you always do by clicking here.

Take care,
ALICIA

Adding and subtracting fractions

There are 3 simple steps to add/subtract fractions:

• 
  Step 1: Make sure the bottom numbers (the denominators) are the same
• Step 2: Add/subtract the top numbers (the numerators). Put the answer over the denominator.
• Step 3: Simplify the fraction (if needed).

See more here.

Practice adding and subtracting fractions with the same denominator.

Practice adding and subtracting fractions with different denominator.

If you feel comfortable with the operations, then try the game. 
After that, play the contest.

 Good luck!

ALICIA