Maths vocabulary

Maths week 4 and 5

Decimals

This week we are learning to subtract decimals

Maintenance maths

Ratios

                                                                   Ratios

Gavin has 50c coins, 20c coins and 10c coins in the ratio of 8:1:2. If 30 of Gavin’s coins are 10c coins, how many 50c and 20c coins does Gavin have? Gavin has 120 50c coins and 15 20c coins.

My strategy:

If 2 will be 30 then 4 will be 60. Then 6 will be 90 and 8 will be 120.

If 2 is 30 then 1 will be 15.

Therefore Gavin has 120 50c coins and 15 20c coins.

Ratios

                                                                  Ratios

A jar contains 550 beans. Of all the beans, ⅖ are white beans and the rest are navy beans.

How many white beans are there? 220

Step 1 - First work out what ⅕ is. ⅕ = 110

Step 2 - Double it. 110+110=220

What is the ratio of white beans to navy beans? 2 : 3

If white beans are ⅖ then the navy beans will be ⅗. So the answer will be 2 : 3

How many navy beans are there? 330

Add 110 to 220 because 110 is ⅕ and 220 is ⅖, so all you have to do to get ⅗ is to add 110 to 220. 220+110=330

Word problem

If I paint 4 fences in 12 days how long will it take me to paint 40 fences? 120

My solution

Step 1: Draw a number line

Step 2: Write all the information you know

Step 3: Look for a relationship

Step 4: Do the same thing to the other side

4 fences 40 fences

Times 3 Times 3

12 days 120 days