Place Value Addition
Add: 82 + 17
99
Add: 3.2 + 5.9.
9.1
33 − 14.
19
Maya bought apples for $4.89 and juice boxes for $3.25. Round each to the nearest dollar and estimate the total. Is $10.00 reasonable? (Answer yes/no and show rounding.)
$4.89 → $5, $3.25 → $3; estimated total = $8. $10.00 is not a reasonable estimate. Exact total = $4.89 + $3.25 = $8.14
Mark drove 345.85 km on day one and 217.30 km on day two. What is the total distance?
345.85 + 217.30 = 563.15 km
Add: 3587 + 412.
3,999
Add: 34.26 + 28.88.
63.14
Subtract: 9.2 − 4.5.
4.7
Round $7.48 to the nearest whole dollar.
$7
Kristi has $1458.90 and pays $36.25 for brunch. How much is left in her account?
$1458.90 − $36.25 = $1,422.65
Add with regrouping: 4,295 + 3,718
8,013
Add: 3587.21 + 741.9 (show work lined up by decimal).
4,329.11
Subtract: 84.21 − 52.75.
31.46
If an item costs $12.37 and you pay with a $20 bill, estimate the change by rounding to the nearest dollar, then find the exact change.
Estimated change ≈ $20 − $12 = $8. Exact change = $20.00 − $12.37 = $7.63
Write a two-step word problem that uses decimal addition and subtraction (include answer).
Sarah bought a toy for $8.75 and a book for $5.60. She paid with $20. How much change did she get? Step 1 add: $8.75 + $5.60 = $14.35. Step 2 subtract: $20.00 − $14.35 = $5.65. Answer: $5.65
Add: 12,406 + 7,589
19,995
Add: 12.45 + 3.678
16.12
Subtract: 7421.50 − 423.83
6,997.67
Kristi has $1458.90 and spends $36.25. Estimate her remaining balance by rounding first, then find the exact remaining balance.
Estimated: $1459 − $36 = $1,423. Exact: $1458.90 − $36.25 = $1,422.65
Leah bought 3 items: $4.50, $2.75, and $6.80. If she pays with $20, how much change should she receive? Show exact work.
Sum = $4.50 + $2.75 + $6.80 = $14.05. Change = $20.00 − $14.05 = $5.95
Explain why you line up digits by place value when adding multi-digit numbers; then add 48,207 + 3,996.
You line up digits by place value so ones with ones, tens with tens, etc., are added correctly; Answer (sum): 52,203
Create an equation that adds to 50.75 and show the addition.
20.50 + 30.25 = 50.75
Explain and show borrowing when subtracting 100.00 − 37.46
Borrow from the 1 in the hundreds to make 10.00 in the ones/decimal positions; 100.00 − 37.46 = 62.54
Give a real-world example where estimating using rounding to the nearest dollar is helpful, and show an estimate and exact calculation for it.
Estimating a grocery total before checkout. Items $4.49, $3.75, $6.20 → round to $4 + $4 + $6 = $14 estimate. Exact total = $4.49 + $3.75 + $6.20 = $14.44
reate and solve a multi-step word problem involving money and decimals that requires estimating first to check reasonableness and then computing the exact answer. Include both estimate and exact result.
Ben buys two shirts at $12.49 each and a hat for $7.95. He pays with $50. Estimate: $12.49 → $12.50 ≈ $13 each, so estimate total shirts = $26, hat ≈ $8, estimated total ≈ $34, estimated change ≈ $16. Exact: shirts = $12.49 × 2 = $24.98; plus hat $7.95 → $24.98 + $7.95 = $32.93. Exact change = $50.00 − $32.93 = $17.07.