Estimate It
Warm-up! About how much is 49 × 21?
What is 1,000?
Warm-up! List the partial products for 23 × 14.
What are 200, 80, 30, and 12?
Warm-up! Multiply: 37 × 6.
What is 222?
Warm-up! Solve: 864 ÷ 8.
What is 108?
Warm-up! Six boxes hold 24 markers each. How many markers are there?
What is 144 markers?
Level up! About how much is 198 x 51?
What is about 10,000?
Level up! List the partial products for 34 x 12.
What are 300, 40, 60, and 8?
Level up! Multiply: 64 x 8.
What is 512?
Level up! Solve: 735 divided by 7.
What is 105?
Level up! Fifteen boxes hold 32 notebooks each. How many notebooks are there?
What is 480 notebooks?
Think it through! About how much is 3,982 ÷ 39?
What is about 100?
Think it through! Multiply: 46 × 32.
What is 1,472?
Think it through! Multiply: 408 × 25.
What is 10,200?
Think it through! Solve: 1,248 ÷ 24.
What is 52?
Think it through! 1,260 students ride 30 buses equally. How many students ride each bus?
What is 42 students?
Math detective! Use compatible numbers to estimate 7,245 divided by 72.
What is about 100?
Math detective! Multiply: 236 x 47.
What is 11,092?
Math detective! Multiply: 326 x 47.
What is 15,322?
Math detective! Solve: 2,880 divided by 32.
What is 90?
Math detective! A school divides 2,304 sheets of paper equally among 36 classes. How many sheets does each class get?
What is 64 sheets?
Boss challenge! Use compatible numbers to estimate 6,128 ÷ 31.
What is about 200?
Boss challenge! What number is missing in this partial-products equation: 125 × 24: 2,500 + 500 + 400 + ___?
What is 100?
Boss challenge! Why composed units must be recorded by place value?
What is to keep the correct value of each digit?
Boss challenge! What is a useful first partial quotient for 4,368 ÷ 21?
What is 200, because 21 × 200 = 4,200?
Boss challenge! A store gets 18 cases of 24 bottles and sells 175. How many bottles are left?
What is 257 bottles?