Early MathSkip counting by 5s up to 100
Count by 5s. Write the missing number in each row.
Every row counts by five, and the sheet says so at the top. Five numbers in a run with one of the middle three missing, so a child counts on from the left and checks against the number on the right. Free printable sheets, with an answer key.
If they get stuck

The answer key prints on a separate page.
Fives start on a multiple of five, so every number on the page ends in a 5 or a 0. That alternation is the pattern being learned and it is the thing to point at: a child who notices that the ones digit only ever has two values has already found half the answer before counting.
Counting by fives is the arithmetic under a clock face and under tally marks, which is why 2.NBT.A.2 names it beside tens and hundreds. It is also the count a child will use for the rest of school without being asked to — five minutes, five cents, five in a tally bundle.
55, 60, 65, ?, 75