Grade 1 - Math
6 printable versions - Building Confidence - About 9 minutes each
Grade 1 - Math - Building Confidence
Worksheet 145 + 1 = ____
Which sum is correct for 19 + 30?
Break apart 20 + 6. Which tens-and-ones idea helps?
A class had 23 counters and found 20 more. How many counters now?
Which number sentence has a total of 38?
43 + 10 = ____
Which sum is correct for 33 + 6?
Break apart 49 + 30. Which tens-and-ones idea helps?
A class had 26 counters and found 3 more. How many counters now?
Which number sentence has a total of 81?
Two-digit addition in first grade is built from place value, not a memorized column algorithm. Children add tens to tens and ones to ones, then combine the parts. The standard expects sums within 100 and includes adding a two-digit number with a one-digit number or a multiple of ten. This worksheet keeps regrouping light and explicit so the child sees why a new ten may be formed. Some questions use base-ten blocks; others ask for the decomposed equation or the final sum. Support pages avoid composing a new ten. Standard and challenge pages include ones totals that cross ten, but still stay within first grade expectations. Ask children to say the tens total and the ones total before combining them.
34 + 20 means 3 tens plus 2 tens and 4 ones, so the sum is 54.
Adding digits without thinking about tens and ones, such as treating 30 as 3.
Add the tens first, then add the ones.