Adding 3 or more two digit numbers

What is step one in adding, 34+28+12+8, using the partial sums method?

• Add your tens

• Adding your ones

• Add your sums

• Grab a calculator

Add your tens value for 34+28+12+8

• 30+2+10+0= 42

• 3+2+1+0=6

• 30+20+10+0= 60

• 30+20+10+0= 50

What is step two in adding, 34+28+12+8, using the partial sums method?

• Add your tens

• Adding your ones

• Add your sums

• Grab a calculator

Add your ones value for 34+28+12+8

• 4+8+2+8=23

• 4+8+2+8=22

• 40+80+20+80=220

• 4+8+2+8=12

What is the final step in adding, 34+28+12+8, using the partial sums method?

• Add your tens

• Adding your ones

• Add your sums

• Grab a calculator

Add your sums for 34+28+12+8

• 60+22= 102

• 60+22= 72

• 60+22= 92

• 60+22=82

31

42

19

+15

_____

When you are finding the breakdown in the ones how can you find the ten to make adding easier?

• 9+1+5+2=17

• 9+1=10+5+2=17

• 9+1=10+5=15

• 9+1=10+5+2=18

31

42

19

+15

_____

How would you find the value of your tens place in the equation above?

• 30+40+10+10= 9

• 30+40+10+10= 80

• 3+4+1+1= 9

• 30+40+10+10= 90

31

42

19

+15

_____

What equation can you use to solve this problem?

• 90+17=170

• 90+17=107

• 90+17=97

• 90+17=16

Solve the following using one of the methods we have used this week, 23+29+15+7

• 84

• 54

• 75

• 74