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+21

Adding 21
for 2nd grade

Add 21 by first adding 20 to a number and then adding 1 more

Below is a table showing the first 8 question answer pairs for the topic "Adding 21" as used in the lessons for this topic. Our games and tests for the topic use these 8 items plus 20 additional question answer pairs.

The topic "Adding 21" is in the category Add + Subtract for 2nd grade (ages 7 to 8).

1 / 8

Adding 21 to 17 by first adding 20 then adding 1 more gives 38

17 + 21

38

2 / 8

Adding 21 to 27 by first adding 20 then adding 1 more gives 48

27 + 21

48

3 / 8

Adding 21 to 68 by first adding 20 then adding 1 more gives 89

68 + 21

89

4 / 8

Adding 21 to 33 by first adding 20 then adding 1 more gives 54

33 + 21

54

5 / 8

Adding 21 to 47 by first adding 20 then adding 1 more gives 68

47 + 21

68

6 / 8

Adding 21 to 162 by first adding 20 then adding 1 more gives 183

162 + 21

183

7 / 8

Adding 21 to 278 by first adding 20 then adding 1 more gives 299

278 + 21

299

8 / 8

Adding 21 to 343 by first adding 20 then adding 1 more gives 364

343 + 21

364

Revise 'Adding 21' with one of our games for 2nd grade

Game icon for math learning game UXO

Game icon for math learning game Duck shoot

Game icon for math learning game The frog flies

Game icon for math learning game Pong

Game icon for math learning game Cat and mouse

Game icon for math learning game The beetle and the bee

The beetle and the bee

Game icon for math learning game Rock fall

Game icon for math learning game Four in a row

Game icon for math learning game Sow grow

Game icon for math learning game Choose or lose

Game icon for math learning game Mix and match

Play any game
with any topic
at any level !

Each of our math topics for elementary are made up of between 6 and 20 question and answer pairs (both the written form and a robot voice speaking those questions and answers). Each topic can be used with all the activities on the site.

Counting * Comparing numbers * Pattern * Place value * Addition * Subtraction * Add + Subtract * Multiplication * Division * Multiply + Divide * Fractions * Measurements * Shapes * Position + Direction * Statistics * Algebra *

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