Read it as a question: 7 − ? = 5 asks what you take from 7 to leave 5. Try a number in the blank and check that the sentence is true.
missing numberthe number that goes in the blank
equalthe same amount
partone of the pieces that make the whole
checkput the number in and see if it's true
Watch for: Combining the numbers shown instead: writing 12 in 7 − ? = 5. Adding when the sentence takes away. Not checking the sentence with the number filled in.
At home: Put 9 crackers out and hide some. Say “9 take away some leaves 6. How many did I hide?” Then lift the napkin to check.
Sample sheet and answer key
Freddie's Frog Pond
Grade 1 · Missing numbers · 1.OA.D.8
NameDate
Freddie the frog lives in a busy pond full of bugs, lily pads and friends. Solve each problem to help Freddie out!
Toby has 9 pebbles. Fern gives Toby some more. Now Toby has 14. How many pebbles did Fern give?
9 + 5 = 14
5pebbles
2
Freddie had some flies. Fern gave Freddie 12 more. Now Freddie has 18. How many flies did Freddie have at first?
18 − 12 = 6
6flies
Answer key
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.
