Rounding whole numbers to the nearest 10, 100, or 1000, and using rounding to estimate answers to calculations.
Where your child meets this in real life: Estimating shopping totals, checking calculator answers are sensible, quick mental approximations
SEAGReady breaks round and estimate with whole numbers into 3 steps, taught in order so each skill builds on the last.
Round whole numbers to the nearest 10 using the rounding rule
Round whole numbers to the nearest 100 or 1000 by applying the rounding rule to larger place values
Use rounding to estimate answers to addition, subtraction, and multiplication problems
Three free sample questions from our round and estimate with whole numbers course. Every question comes with a full explanation, and hints that guide without giving the answer away.
Sean counted 67 sweets in a jar. Round 67 to the nearest 10.
Answer: A. 70
Look at the ones digit in 67. The ones digit is 7. Is 7 five or more? Yes! Round UP to the next ten: 67 rounds to 70.
Stuck? Start here: Look at the ones digit. What is the ones digit in 67?
The distance from Belfast to Armagh is 3,456 kilometres by the scenic route. Round 3,456 to the nearest 100.
Answer: A. 3,500
To round to the nearest 100, look at the tens digit. In 3,456, the tens digit is 5. 5 is five or more, so round UP. 3,456 rounds to 3,500.
Stuck? Start here: To round to the nearest 100, look at the tens digit.
Conor wants to buy a book for 47 pounds and a game for 32 pounds. Estimate the total cost by rounding to the nearest 10 first.
Answer: A. About 80 pounds
Round each number to the nearest 10: 47 -> 50 (7 is 5 or more, round up) 32 -> 30 (2 is less than 5, round down) Add the rounded numbers: 50 + 30 = 80 The estimate is about 80 pounds.
Stuck? Start here: First round each number to the nearest 10. What does 47 round to?
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Ciara counted 67 books on the library shelf.
Round 67 to the nearest 10.
67 → ?
Step 1 of 4
Ciara counted 67 books on the library shelf.
Round 67 to the nearest 10.
67 rounded to the nearest 10 is 70.
The key insight: If the ones digit is 5 or more, round up. If it's less than 5, round down!
Watch out: 67 rounds to 60. The ones digit is 7, which is 5 or more, so we round UP to 70, not down to 60.
These are the misconceptions we see most often in round and estimate with whole numbers, including the ones our practice questions are specifically designed to catch.
Struggling with round and estimate with whole numbers? The real gap is often in one of these earlier topics.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.