Question

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find and write the missing numbers to make the equations true.

1. $13 + 7 + \underline{\quad} = 27 + 8$
2. $10 + 8 + 12 = 33 - \underline{\quad}$
3. $\underline{\quad} + 15 + 15 = 10 + 32$
4. $4 + 13 + 10 = \underline{\quad} - 13$

write a number story for the problem. complete the equation to match your

1. $28 + 35 = \underline{\quad}$

Explanation:

Step1: Calculate right-hand side (Q11)

$27 + 8 = 35$

Step2: Calculate known left sum (Q11)

$13 + 7 = 20$

Step3: Solve for missing value (Q11)

$35 - 20 = 15$

Step4: Calculate left-hand side (Q12)

$10 + 8 + 12 = 30$

Step5: Solve for missing value (Q12)

$33 - 30 = 3$

Step6: Calculate right-hand side (Q13)

$10 + 32 = 42$

Step7: Calculate known left sum (Q13)

$15 + 15 = 30$

Step8: Solve for missing value (Q13)

$42 - 30 = 12$

Step9: Calculate left-hand side (Q14)

$4 + 13 + 10 = 27$

Step10: Solve for missing value (Q14)

$27 + 13 = 40$

Step11: Calculate sum (Q15)

$28 + 35 = 63$

Step12: Create number story (Q15)

Lila has 28 stickers, and her friend gives her 35 more. The total number of stickers Lila has now is the sum of these two amounts.

Answer:

1. 15
2. 3
3. 12
4. 40
5. 63; Number story: Lila has 28 stickers, and her friend gives her 35 more. How many stickers does Lila have in total? The matching equation is $28 + 35 = 63$.