# How to do Maths questions with brackets S4

# Uimhreacha príomha – Prime numbers

Eratosthenses was a Greek mathematician who figured out that to find all the prime numbers between two and some large number, you need to remove all the multiples of each number between two and your large number. Start by pressing “2” (skip over “1”), and you’ll see all the multiples of two eliminated: 2,4,6,8, etc. Next, click on “3” and so on. At some point the program will stop, and all the prime numbers between 2 and 400 will be coloured red. Can you guess the biggest number you will need to click?

# Luach suímh

# Mata- sortáil

# Fractions / Codáin

# Maths Trail (Step 4 Maths)

Last week all of the Senior Class did an outdoor/indoor Maths Trail.

We were split into groups of threes and fours. In my group there was myself, Siobhán and Rosaleen. We were Goup 2.

Everyone got a measuring tape and a sheet with pencils on it.

We (my group) started on Question 1, which said to measure the width of the front door.

Some of the questions were quite easy: measuring from the front door to the gate, for example.

We had to estimate all of the questions before we answered them for real.

Once we answered all the questions we ran to the teacher for her to correct it but we got one of the questions wrong so we corrected it and brought it back to the teacher.

We came second! Amy’s team cam first!

By Ailish

# Analysing Data (Step 4: Maths)

# Mata – seomra na naíonáin

Bhíomar ag foghlaim faoina cruthanna 2-T agus 3-T le déanaí. Thog na páistí isteach cruthanna ón Bhaile. Rinneamar tacair de na cruthanna agus tacair de na cruthanna a rollann/nach rollann freisin, ag baint úsáid as rudaí sa seomra ranga agus rudaí ón Bhaile. Thóg na páistí a chruthanna féin. Bhí an-spórt againn.

# Roinnt – Division ó Khan Academy

# Mata – Am

# Iolrú simplí – Simple Multiplication on Khan Academy

# Iolrú fada – Long multiplication from Khan Academy

# Slánuimhreacha a shlánú go dtí an deich ó Khan Academy- Rounding to the nearest ten from Khan Acadmey

# Uimhreacha priomha~ Prime numbers

Eratosthenses was a Greek mathematician who figured out that to find all the prime numbers between two and some large number, you need to remove all the multiples of each number between two and your large number. Start by pressing “2” (skip over “1”), and you’ll see all the multiples of two eliminated: 2,4,6,8, etc. Next, click on “3” and so on. At some point the program will stop, and all the prime numbers between 2 and 400 will be colored red. Can you guess the biggest number you will need to click?