Multi-Digit
Addition
Addition
What is 2,314 + 4,231?
6,545
Round 4,326 to the nearest hundred.
4,300
Nico has 5 stickers. Alex has 3 times as many stickers as Nico. How many stickers does Alex have?
15 stickers
Joe baked 144 brownies. Kevin baked 49 more brownies than Joe.
Part A: Estimate total brownies to the nearest 10.
Part B: Calculate exactly how many brownies they baked together.
Part C: Is your answer reasonable?
Part A – Joe ≈ 140, Kevin ≈ 190 Total ≈ 140 + 190 = 330
Part B – Joe + Kevin = 144 + 193 = 337
Part C – Yes, 337 is close to the estimate of 330, so it’s reasonable.
What is 8,542 − 3,231?
5,311
What is 3,578 + 2,649?
6,227
Round 27,650 to the nearest thousand.
28,000
A frog can jump 8 inches. A rabbit can jump 4 times as far as the frog. How far can the rabbit jump?
32 inches
Samantha sold 238 lemonade cups. Marcus sold 65 fewer cups than Samantha.
Part A: Estimate total cups sold to the nearest 10.
Part B: Calculate exactly how many cups were sold.
Part C: Is your answer reasonable?
Part A: Samantha ≈ 240, Marcus ≈ 180 → Total ≈ 420
Part B: 238 + (238 − 65) = 238 + 173 = 411
Part C: Yes, 411 is close to my estimate of 420 so it’s reasonable.
What is 6,402 − 2,589?
3,818
What is 45,762 + 38,549?
84,311
Round 46,278 to the nearest ten thousand.
50,000
A cat weighs 9 pounds. A dog weighs 5 times as much as the cat. How much does the dog weigh?
45 pounds
A school library bought 356 books. Another school bought 127 more books than the first school.
Part A: Estimate total books to the nearest hundred.
Part B: Calculate exactly how many books both schools bought.
Part C: Is your answer reasonable?
Estimate: First ≈ 400, Second ≈ 400 + 100 = 500 → Total ≈ 900
Exact: 356 + (356 + 127) = 356 + 483 = 839
Reasonable? Yes, 839 is close to my estimate of 900 so it’s reasonable.
What is 73,205 − 46,789?
26,416
What is 234,578 + 345,689?
580,267
Round 349,611 to the nearest hundred thousand.
300,000
Sara has 3 pumpkins. Mia has 4 times as many pumpkins as Sara, and Jake has 3 times as many pumpkins as Mia. How many pumpkins does Jake have?
36 pumpkins
Emma planted 11 sunflowers. Liam planted 4 times as many sunflowers as Emma. Noah planted 2 times as many sunflowers as Liam.
Part A: Estimate total sunflowers.
Part B: Calculate exactly how many sunflowers they planted altogether.
Part C: Is your answer reasonable?
Estimate: Emma ≈ 10, Liam ≈ 40, Noah ≈ 80 → Total ≈ 130
Exact: Liam = 11 × 4 = 44, Noah = 44 × 2 = 88 → Total = 11 + 44 + 88 = 143
Reasonable? Yes, 143 is close to my estimate of 130, so it’s reasonable.
What is 504,726 − 287,489?
217,237
What is 4,567,893 + 3,678,984?
8,246,877
958,462 to the nearest ten thousand.
960,000
Victoria has 4 sugar cookies. Isabelle has 3 times as many sugar cookies as Victoria, and Vincent has 8 times as many chocolate chip cookies as Isabelle. How many chocolate chip cookies does Vincent have?
96 chocolate chip cookies
At a toy store, Olivia sold 15 puzzles, Jackson sold 2 times as many puzzles as Olivia, and Sophia sold 3 times as many puzzles as Jackson.
Part A: Estimate total puzzles sold.
Part B: Calculate exactly how many puzzles they sold altogether.
Part C: Is your answer reasonable?
Estimate: Olivia ≈ 20, Jackson ≈ 40, Sophia ≈ 120 → Total ≈ 180
Exact: Jackson = 15 × 2 = 30, Sophia = 30 × 3 = 90 → Total = 15 + 30 + 90 = 135
Reasonable? Yes, 135 is close to my estimate of 180, so it’s reasonable.
What is 8,230,647 − 4,785,938?
3,444,709