Addition Algorithms S Matthews PartialSums Method for Addition

Partial-Sums Method for Addition Add from left to right and column by column. The

Let’s practice the value of digits for Partial-Sums. t s r i f e

Let’s practice the value of digits for Partial-Sums. Your turn. g n i d

Let’s practice the value of digits for Partial-Sums. . e u n i t

Add the 100’s: 300 + 400 = Add the 10’s: 90 + 30 =

Now, you try the Partialsums method using the numbers we practiced.

Add the 100’s: Add the 1’s: Find the total 300 + 800 = 376

Add the 100’s: 400 + 200 = Add the 10’s: 70 + 80 =

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Addition Algorithms S. Matthews

Partial-Sums Method for Addition Add from left to right and column by column. The sum of each column is recorded on a separate line. The value of each digit is determined by its place in the numeral.

Let’s practice the value of digits for Partial-Sums. t s r i f e w , 5 4 + 3 2 m e l b o r p e h t In. 4 d n a 2 e h t d ad , s n e t 2 h t r o w s i 2 e h t , r e v e How e w o S. s n e t 4 h t r o w s i 4 e h t and. 4 t o n , 0 4 d n a ; 2 t o n , 0 2 y sa

Let’s practice the value of digits for Partial-Sums. Your turn. g n i d d a n e h w y a s e w o d t Wha + 6 7 3 r o f e c a l p s ’ d e r d n u h the 832?

n a ; , 0 0 t o n 8 d 3 ! t t i o ’s t n 0 o , 0 g 0 1 e 30 v e ’ h u ay t o f o Y es m u W s e h 8. t s i t ha ? W ce pla

h t r o w s i 3. o f 0 e t 0 h ’ t 8 n , h 2 t r Ca 3 o 8 w d s n i a e 8 n e 6 v 7 d th e l 3 e r In , a n o 0 0 0 1 , 30 1 s i 00 8 + 0 30 dred. hun ! u o y l o

Let’s practice the value of digits for Partial-Sums. . e u n i t n o c s ’ t Le g n i d d a n e h w y a s e w o d t Wha ? 2 3 8 + 6 7 3 r o f e c a l p s n e t the

n a ; 0 3 d o n , 7 ! t t h o e g n ir h t , f 0 s ’ o 7 t a y m h a u T es s e h W t s i t ha ? W ce pla . 3 t ’s 0 1

! u o y l o h t r wo s i 7 o f e t h ’ t n , 2. Ca 3 0 8 3 d th n r a o w. 6 s s 7 i n 3 e t In the 3 n e t r d o n a 0 0 1 is 0 3 + 70 , 0 7

Tak e add a lo ok i t i o a Me n tho usin t the s d. g th tep e s P The arti for al-S som n we’l u ms l em pra ctic ore e th. em eth od

Add the 100’s: 300 + 400 = Add the 10’s: 90 + 30 = Add the 1’s: Find the total 8+5= 398 + 435 700 120 + 13 833

Now, you try the Partialsums method using the numbers we practiced.

Add the 100’s: Add the 1’s: Find the total 300 + 800 = 376 + 832 1100 70 + 30 = 6+2= + 8 1, 208

You are good! Let’s try just one more.

Add the 100’s: 400 + 200 = Add the 10’s: 70 + 80 = Add the 1’s: Find the total 9+5= 479 + 285 600 150 + 14 764

. ! t n e l l e c x E I know yo it f o g n a h e h t t o g e v u’ n, ditio d a r o f d o ms meth l-Su a i t r a P e h in t , t e g r o f t ’ Don you: 0’s, 0 1 e h t d • ad. . d s n ’ u 1 o f e t h t s u uj o y • add s m u s dd the a n e h T • s) m u s l a i t r a (the p

Keep practicing. Peace!