Transcript Standard written form for addition

Standard written form for addition
I am learning a standard method of doing an addition problem on
paper when the numbers are too difficult to find the answer
mentally.
In your head
Numbers are set out directly
below each other.
e.g. 347
+ 265
There are 267 students in the junior school and 148 students in the
senior school. How many students are there in total? 267 + 148 = ?
Step 1: For our first example let’s expand each number and write
them underneath each other.
100 10
200 + 60 + 7
+ 100 + 40 + 8
400 + 10 + 5
Step 2: Add the ones together.
7 + 8 = 15. Fifteen is made up of a ten and a five.
Write the 5 in the ones column and carry the 10 to
the tens column.
Step 3: Add the tens together.
10 + 60 + 40 = 110. 110 is made up of one hundred and one ten. Write
the 10 in the tens column and carry the 100 to the hundreds column.
Step 4: Add the hundreds together.
100 + 200 + 100 = 400
Step 5: Add the bottom line together
to get your answer.
400 + 10 + 5 = 415
Room 7 made 216 paper cranes at the start of the week and another
138 paper cranes at the end of the week. How many paper cranes
have they made? 216 + 138 = ?
Step 1: Now let’s try the same algorithm without expanding the
number.
1
216
+ 138
35 4
Step 2: Add the ones together.
6 + 8 = 14. Put the 4 in the ones column and carry the ten to
the tens column. We will record this as a 1 above the tens
column (e.g. it is one ten).
Step 3: Add the tens together. 1 (ten) + 1 (ten) + 3 (tens) = 5 (tens)
Record 5 tens in the tens column.
Step 4: Add the hundreds together. 2 (hundreds) + 1 (hundred) = 3 (hundreds)
You have now worked out the answer. 354
Now try these questions on your own. You will need to use pen and paper
to record your algorithm.
1) 672 + 319 = ?
991
2) 438 + 247 = ?
685
3) 586 + 348 = ?
934
4) 261 + 179 = ?
440
5) 854 + 128 = ?
982
Click again when you have
completed each question and
the answer will be displayed.
Need some more practise? Try Pg59 of Teacher Tools Addition and
Subtraction Book Numeracy resources