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+21

Adding 21
for 1st grade

Add 21 by 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 1st grade (ages 6 to 7).

1 / 8

Adding 21 to 10 by first adding 20 then adding 1 more gives 31

10 + 21

31

2 / 8

Adding 21 to 15 by first adding 20 then adding 1 more gives 36

15 + 21

36

3 / 8

Adding 21 to 20 by first adding 20 then adding 1 more gives 41

20 + 21

41

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 62 by first adding 20 then adding 1 more gives 83

62 + 21

83

7 / 8

Adding 21 to 74 by first adding 20 then adding 1 more gives 95

74 + 21

95

8 / 8

Adding 21 to 87 by first adding 20 then adding 1 more gives 108

87 + 21

108

Revise 'Adding 21' with one of our games for 1st 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
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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 *

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