Add hundreds, tens and ones in a ten-question round, including sums that cross a hundred.
Addition within 1,000
Your addition round
Ten questions with clear feedback, beginning with familiar numbers and building to crossing a hundred.
Addition within 1,000Question 1 / 10
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64 + 23 =
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Keep each place in its column
For 324 + 251, add the hundreds (300 + 200), tens (20 + 50), and ones (4 + 1). The parts make 575. Writing the places in order prevents a tens digit from being treated as a ones digit.
Cross a hundred deliberately
For 278 + 145, start with 278 + 100 = 378, then add 40 to get 418 and 5 to get 423. The last steps move through 400; estimate 280 + 140 ≈ 420 before accepting an answer.
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