Practice Problems — Set 6

2.NBT.B.8 · Mentally add 10 or 100 to a given number 100-900, and mentally subtra…

Print and write your answers. Use diagrams to show thinking.

Warm-up

1. Talk through today's focus: Mentally add 10 or 100 to a given number 100-900, and mentally subtra… 2. Try one oral example together before writing. 3. Use the diagram to explain your thinking.

_See printable PDF for diagram._

Written practice

1. Write the value of the underlined digit in 186: ___ 2. 36 = ___ tens + ___ ones 3. Expanded form: 46 = ___ + ___ 4. Which is greater: 31 or 38? ___ 5. Write the numeral: 7 tens and 3 ones → ___ 6. Round 53 to the nearest ten: ___ 7. Apply Mentally add 10 or 100 to a given number 100-900, and mentally subtra… (item 7, set 6): show your work. ___ 8. Apply Mentally add 10 or 100 to a given number 100-900, and mentally subtra… (item 8, set 6): show your work. ___

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More written practice

1. Apply Mentally add 10 or 100 to a given number 100-900, and mentally subtra… (item 9, set 6): show your work. ___ 2. Apply Mentally add 10 or 100 to a given number 100-900, and mentally subtra… (item 10, set 6): show your work. ___ 3. Apply Mentally add 10 or 100 to a given number 100-900, and mentally subtra… (item 11, set 6): show your work. ___ 4. Apply Mentally add 10 or 100 to a given number 100-900, and mentally subtra… (item 12, set 6): show your work. ___ 5. Apply Mentally add 10 or 100 to a given number 100-900, and mentally subtra… (item 13, set 6): show your work. ___ 6. Apply Mentally add 10 or 100 to a given number 100-900, and mentally subtra… (item 14, set 6): show your work. ___

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Patterns and rules

1. Each place is ten times the place to its right. 2. Compare from the largest place first. 3. Expanded form shows the value of each digit.

_See printable PDF for diagram._

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Parent tip: Use base-ten blocks or place-value charts