The word sumaban is the imperfect form of sumar in the third person plural.
See the full sumar conjugation

sumar

sumar(
soo
-
mahr
)
An intransitive verb is one that does not require a direct object (e.g. The man sneezed.).
intransitive verb
1. (to count)
a. to add
Marina aprendió a sumar y a restar en su clase de matemáticas.Marina learned to add and subtract in her math class.
A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
transitive verb
2. (to include)
a. to add
Con el Internet, ahora cualquiera puede sumar su voz al llamado al cambio.With the internet, anyone can now add their voice to the call for change.
3. (to count)
a. to add up to
Seis y cuatro suman diez.Six and four add up to ten.
sumarse
A reflexive verb is a verb that indicates that the subject performs an action on itself (e.g. Miguel se lava.).
reflexive verb
4. (to participate in)
a. to join
¿Desean sumarse a nuestro maratón de Star Wars en mi casa esta noche?Do you want to join our Star Wars marathon at my house tonight?
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sumar
A transitive verb is a verb that requires a direct object (e.g. I bought a book.).
transitive verb
1. (varias cantidades)
a. to add together
tres y cinco suman ochothree and five are o make eight
súmale diezadd ten
2. (añadir)
a. to add
súmale a eso todas las mentiras que nos ha dichoto that we also have to add all the lies he's told us
suma y siguecarried forward
3. (costar)
a. to come to
A pronominal verb always uses a reflexive pronoun. (e.g. Te ves cansado.).
pronominal verb
4. (general)
a. to join
sumarse a la opinión de alguiento adhere to somebody's opinion
sumar
transitive verb
1 (Matemáticas) to add (together)
suma estas dos cantidades add these two amounts (together)
2 (totalizar) to add up to; come to
la cuenta suma seis dólares the bill adds up o comes to six dollars; dos y dos suman cuatro two and two are o make four
3 (resumir) to summarize; sum up
intransitive verb
to add up
suma y sigue (Contabilidad) carried forward
pronominal verb
sumarse
sumarse a algo to join sth; sumarse a un partido to join a party; sumarse a una protesta to join in a protest
Collins Complete Spanish Electronic Dictionary © HarperCollins Publishers 2011
Examples
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Conjugations
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