TB 5A Units 1-2 revision

Review multi digit number

Rounding revision

Round the number below to nearest thousands.

1,340,879

Step 1 look at the next digit
after the thousands digit (that is the 8)

Rounding revision

Round the number below to nearest thousands

1,340,879

Step 2 The value of the
hundreds is 8 it is greater then 5 so you carry the 1 and add it to the thousands.

1,341,879

Rounding revision

Round the number below to nearest thousands

1,340,879

1,341,879

Step 3 Change the

hundreds, and all digits

after it to ‘0’.

1,341,000

3,148,258

3,100,000

Round the number below to the nearest hundred thousand.

Rounding revision

Step 1 look at the next digit
after the hundred thousand digit.

Step 2 It’s smaller then 5 so
the hundred thousand digit
stays the same.

​Step 3 change all the digits after hundred thousand to 0.

Rounding revision

Important! Remember when
rounding 5 or more round up. Less then 5 round down.

Estimation

To count all the books
on the bookcase would
take a very long time so
to make it quicker we
can estimate!

26 books on the top shelf and 4
shelves in total

26 x 4= 104

So there is about 104 books in total

Some pictures we
need to split up first

before we can
estimate them

Look at the picture

carefully and split it up

in to a few equal parts.

Then choose 1 section
and count the number of

beans in it. Finally

multiply the number of
beans in one section by
the number of sections

22 beans in this
section.

22 x 9 = 198

So total amount of
beans is about 198.

How to prepare your own workshop?

Step 1

The Sun is the star at the
center of the Solar System

Step 2

Saturn is composed mostly of

hydrogen and helium