Math Practice Problems - Understanding 11 to 19

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Understanding 11 to 19 - Sample Math Practice Problems

The math problems below can be generated by MathScore.com, a math practice program for schools and individual families. References to complexity and mode refer to the overall difficulty of the problems as they appear in the main program. In the main program, all problems are automatically graded and the difficulty adapts dynamically based on performance. Answers to these sample questions appear at the bottom of the page. This page does not grade your responses.

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Complexity=1, Mode=eqv

Choose the tens + ones form of the number -- for example, 1X = 10 + X.

Complexity=1, Mode=eq

Complete the equation in the form of tens + ones (e.g., 10 + 5).

Complexity=2, Mode=eq

Complete the equation in the form of tens + ones (e.g., 10 + 5).

Answers

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 8 ones.

# Tens	# Ones
1	8

There are 18 shaded squares.

Problem

Correct Answer

Your Answer

# shaded squares:

Solution
There is one block of ten and 4 ones.

# Tens	# Ones
1	4

There are 14 shaded squares.

Complexity=1, Mode=eqv

Choose the tens + ones form of the number -- for example, 1X = 10 + X.

Problem

Correct Answer

Your Answer

13 = 10 + 3

13 = 1 + 3

13 = 11 + 2

13 = 13 + 0

13 = 12 + 1

13 = 10+1+1+1

Solution

1 block of tens	+	3 ones	=
10	+	3	= 13

Problem

Correct Answer

Your Answer

12 = 11 + 1

12 = 1 + 2

12 = 10+1+1

12 = 10 + 2

12 = 12 + 0

Solution

1 block of tens	+	2 ones	=
10	+	2	= 12

Complexity=1, Mode=eq

Complete the equation in the form of tens + ones (e.g., 10 + 5).

Problem

Correct Answer

Your Answer

11 =

11 = 1 + 1

11 = 11 + 0

11 = 10 + 1

Problem

Correct Answer

Your Answer

14 =

14 = 1 + 4

14 = 14 + 0

14 = 12 + 2

14 = 10 + 4

14 = 10+1+1+1+1

14 = 11 + 3

Complexity=2, Mode=eq

Complete the equation in the form of tens + ones (e.g., 10 + 5).

Problem

Correct Answer

Your Answer

72 =

72 = 72 +

72 = 72 + 0

72 = 70+1+1

72 = 70 + 2

72 = 7 + 2

72 = 71 + 1

Problem

Correct Answer

Your Answer

31 =

31 = 31 + 0

31 = 3 + 1

31 = 30 + 1

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