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Addition Strategies Introduction

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Addition Strategies Introduction

A local fun run is preparing supplies. Use addition strategies to check totals efficiently. You may count on, partition numbers, bridge to a friendly number, or use a number line. Show your thinking where asked.

Choose a strategy

Think about which method makes each calculation easiest.

1.Match each addition term with its meaning.

sum
partition
count on

split a number into smaller parts
the answer when numbers are added
start at one number and count forwards

2.Complete the sentence: When I 38 and 25, the is 63. Use the words add and sum.

3.A volunteer has 46 drink bottles and collects 4 more. Which strategy is especially handy for finding 46 + 4?

Count on to the next ten
Partition both numbers into hundreds
Estimate by rounding to the nearest thousand

4.Count on from 128 to solve 128 + 7. Write the number you start at, then the total.

5.The course marshal counts 235 runners at one checkpoint and 178 at another. Partition 178 into 100, 70 and 8, then add it to 235.

6.Use the number line to show jumps that solve 286 + 37. You may split 37 into 30 and 7.

Use addition in the event plan

Select and explain strategies to solve realistic totals.

7.Water station A has 1,248 cups and station B has 975 cups. Bridge to a friendly number by adding 1,000 first, then adjust. What is the total?

8.Two supply boxes contain 3,465 and 2,738 safety pins. Partition by place value to find the combined total. Show at least two steps.

9.True or false? For 398 + 205, adding 2 to 398 to make 400 and then adding 203 gives the same total.

TrueFalse

10.The fun run sold 586 adult entries and 749 junior entries. Choose a strategy, calculate the total, and explain why your strategy suits these numbers.

11.A helper estimates 2,984 + 1,127 as about 4,000 by rounding to the nearest thousand. Is this a sensible estimate? Then find the exact sum.

12.Reflect: Which addition strategy from this worksheet would you choose for 4,998 + 326, and why? Include the correct total.