Math Skill: Understanding 11 to 19

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Understanding 11 to 19

This topic assumes you know how to count.
To review, please see the topic Counting Objects.

There are blocks of ones.

3 blocks

There are blocks of ten.

or

Examples:
Complete the equation (e.g., 11 = 10 + 1).

= +

= +

= +

= +

= +

= +

Examples: Equations only
Complete the equation with the form tens + ones (e.g., 10 + 5).

15 = +
11 = +
19 = +

Complexity=1, Mode=ct

Count the number of shaded squares.

Problem

Correct Answer

Your Answer

# shaded squares:

Solution
There is one block of ten and 6 ones.

# Tens	# Ones
1	6

There are 16 shaded squares.

Problem

Correct Answer

Your Answer

# shaded squares:

Solution
There is one block of ten and 3 ones.

# Tens	# Ones
1	3

There are 13 shaded squares.

Complexity=1, Mode=eqv

Complete the equation (e.g., 11 = 10 + 1).

Problem

Correct Answer

Your Answer


	=		+

= +

Solution

1 block of tens	+	8 blocks of ones	=
10	+	8	= 18

Problem

Correct Answer

Your Answer


	=		+

= +

Solution

1 block of tens	+	7 blocks of ones	=
10	+	7	= 17

Complexity=1, Mode=ct

Complexity=1, Mode=eqv

Complexity=1, Mode=eq

Complexity=2, Mode=eq

Answers

Complexity=1, Mode=ct

Complexity=1, Mode=eqv

Complexity=1, Mode=eq

Complexity=2, Mode=eq