Say what each digit is worth: in 421 the 4 is 400, the 2 is 20 and the 1 is 1. Write those as a sum. To go back, put each value in its place.
digitsthe symbols 0 to 9 used to write numbers
expanded forma number as a sum of its places: 400 + 20 + 1
number namethe number in words
placehundreds, tens or ones
Watch for: Writing 900 + 5 as 95, dropping the zero in the tens. Writing 4 + 2 + 1 instead of 400 + 20 + 1. Writing “four hundred fifty-three” as 40053.
At home: Read house numbers, prices or page numbers aloud together, then ask what each digit is worth.
Sample sheet and answer key
Freddie's Frog Pond
Grade 2 · Reading and writing numbers · 2.NBT.A.3
NameDate
Freddie the frog lives in a busy pond full of bugs, lily pads and friends. Solve each problem to help Freddie out!
Words to numbers
Write each number with digits.
six hundred two→four hundred seventy-six→nine hundred ninety-six→two hundred eighty-two→
New problems every time, three levels (gentle, core and stretch), themes to pick from, a second page if you want one. Each sheet comes with an answer key and a one-page guide for grown-ups.