Yvonne Brown. When you add two numbers together you find how many you have in all. 5+3=8 12345 + 123 = 12345678 0+0=00+1=10+2=20+3=30+4=40+5=5 1+0=11+1=21+2=31+3=41+4=51+5=6.

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Presentation transcript:

Yvonne Brown

When you add two numbers together you find how many you have in all. 5+3= = =00+1=10+2=20+3=30+4=40+5=5 1+0=11+1=21+2=31+3=41+4=51+5=6 2+0=22+1=32+2=42+3=52+4=62+5=7 3+0=33+1=43+2=53+3=63+4=73+5=8 4+0=44+1=54+2=64+3=74+4=84+5=9 5+0=55+1=65+2=75+3=85+4=95+5=10 6+0=66+1=76+2=86+3=96+4=10 7+0=77+1=87+2=97+3=10 8+0=88+1=98+2=10 9+0=99+1= =10

Adding Tens How to add two-digit numbers (for example ). Place one number above the other so the tens' place digits and ones' place digits are lined up. Draw a line under the bottom number

Adding Tens cont’d Add the two ones' place digits. (0 + 0 = 0). Place the zero below the line in the ones' place column Add the numbers in the tens' place column (4 + 5 = 9) and place the answer below the line and to the left of the ones' place sum

Adding Three One-digit Numbers Adding three numbers (for example ) involves two steps. Mentally add the first two numbers. (5 + 8 = 13). Add the other number to this sum. ( = 20).

Adding Hundreds How to add three-digit numbers (for example ). Place one number above the other so the hundreds' place digits, the tens' place digits and ones' place digits are lined up. Draw a line under the bottom number Add the two ones' place digits. (0 + 0 = 0)

Adding Hundreds Cont’d Add the numbers in the tens' place column (0 + 0 = 0) and place the answer below the line and to the left of the ones' place sum Add the numbers in the hundreds' place column (6 + 5 = 11) and place the answer below the line and to the left of the tens' place sum

Resources Bainfill, J. (2012). AAA Math. Rerieved from