20 two-digit, no carrying problems with an answer key. Print with your browser; the answers print on a separate page.
How to use this worksheet
Print it, set a time limit if you like, and mark it with the key. Press “New worksheet” for a fresh set of numbers at the same level: every set is different, so it works for repeated practice and for a whole class.
Worked example: 10 + 11
Here is the method for the first problem on this sheet, step by step. The same steps work for every problem at this level.
- Ones column: 0 + 1 = 1. Write 1.
- Tens column: 1 + 1 = 2. Write 2.
- Read the digits from left to right: the answer is 21.
What this level practises
Two-digit, no carrying is usually taught in grade 1. This sheet has 20 problems; the answers run from 21 to 99, and the problem with the largest answer is 31 + 68 = 99. Work through the sheet without a calculator, then mark it with the key: the aim is accuracy first and speed second.
Tips for addition
- Line the numbers up by place value before adding: ones under ones, tens under tens.
- Always start with the ones column and move left, so carried digits land in the right place.
- Estimate first by rounding to the nearest ten. If the answer is far from the estimate, look for a missed carry.
- Once a sheet is easy, time it and try to beat the time on the next one rather than moving up a level straight away.
Printing
Use your browser’s print command. The menus, buttons and ads are left off the printout, and the answer key starts on a new page so it can be kept back. For a whole class, print one sheet, press “New worksheet” and print again to give each group different numbers.
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