1.4 Numbers to 99

Unit Goals

• Students develop an understanding of place value for numbers up to 99.

Section A Goals

• Add and subtract multiples of 10.
• Represent the base-ten structure of multiples of 10 up to 90 using towers of 10, drawings, numbers, or words.

Section B Goals

• Add and subtract multiples of 10.
• Represent the base-ten structure of numbers up to 99 using drawings, numbers, and words.
• Understand that the two digits of a two-digit number represent amounts of tens and ones.

Section C Goals

• Compare 2 two-digit numbers based on the values of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

Section D Goals

• Represent two-digit numbers in different ways, using different amounts of tens and ones.

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