Lesson Worksheet: Word Problems: Adding Numbers up to 20 Mathematics • 1st Grade

In this worksheet, we will practice solving addition problems with numbers up to 20 by finding either the missing part or the whole and will practice solving additive comparison problems.


Jacob built a tower with 8 blocks. He then added 5 more blocks. How many blocks are in the tower now?


6 children were playing in a playground. They were joined by another group of children. After that, there were 10 children in the playground. How many children were in the group that joined?


Scarlett built a tower with 14 blocks, but 6 blocks fell off. How many blocks are still in the tower?


Waiters were serving food to a table. After 6 plates had been served, there were 9 people who still needed food. How many people were at the table?


A group of girls were dancing. 4 boys joined in and then there were 8 people dancing in total. How many girls were there?


A group of fairies were flying around a flower. After 4 more fairies joined the group, there were 14 fairies in total.

How many fairies were there at the start?


Daniel is 2 years old. Liam is 1 year older than Daniel. Hannah is 5 years older than Liam. How old is Hannah?


Olivia has 4 brothers and 2 sisters. How many brothers does her brother William have? How many sisters does William have?

  • A4 brothers, 2 sisters
  • B4 brothers, 3 sisters
  • C3 brothers, 3 sisters
  • D3 brothers, 2 sisters


There are 10 children playing a game in the garden and seven more children in the garden. How many children are there?


There are 6 brown cows in a field. They are joined by 5 white cows. Which expression shows how many cows are in the field now?

  • A65
  • B6+5


Hannah planted 7 roses and 5 sunflowers in her yard. Choose the addition sentence that shows this using a blank for the total number of flowers.

  • A7+12=
  • B7+5=
  • C5+=7
  • D7+=12
  • E12+5=


Here are some counters with numbers:

Choose the two numbers that make the equation true.

  • A7, 14
  • B9, 14
  • C7, 15
  • D9, 15
  • E6, 14

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