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Questions and Answers
Which of the following is a special case when understanding two-digit numbers?
Which of the following is a special case when understanding two-digit numbers?
- 10 can be thought of as a bundle of ten ones
- The numbers from 11 to 19 are composed of a ten and one
- The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens
- All of the above (correct)
Which of the following strategies can be used for addition and subtraction within 10?
Which of the following strategies can be used for addition and subtraction within 10?
- Counting on
- Making ten
- Decomposing a number leading to a ten
- All of the above (correct)
What does a two-digit number represent in terms of tens and ones?
What does a two-digit number represent in terms of tens and ones?
- Amount of ones
- Amount of hundreds
- Amount of thousands
- Amount of tens (correct)
What is the reasoning used to mentally find 10 more or 10 less than a two-digit number?
What is the reasoning used to mentally find 10 more or 10 less than a two-digit number?
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What does the number 20 represent in terms of tens and ones?
What does the number 20 represent in terms of tens and ones?
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Study Notes
Understanding Two-Digit Numbers
- Teen numbers (11-19) are special cases when understanding two-digit numbers.
Strategies for Addition and Subtraction
- Counting on or back by ones is a strategy used for addition and subtraction within 10.
Representation of Two-Digit Numbers
- A two-digit number represents tens and ones, where the tens digit tells how many groups of 10 and the ones digit tells how many ones.
Mental Math Strategies
- To mentally find 10 more or 10 less than a two-digit number, you can use the reasoning that adding or subtracting 10 is the same as adding or subtracting 1 ten.
Representation of 20
- The number 20 represents 2 tens and 0 ones.
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