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Hidden Sum Detectives

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Hidden Sum Detectives

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About this activity

Two-stage addition clues

Created by

Hidden Author
Hidden Author
Lebanon

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Hidden Sum Detectives
 

Hidden Sum DetectivesOnline version

Two-stage addition clues

by Hidden Author
1

STATEMENT: I am the result you get before adding 125 740 in the expression 125 740 + (532 765 + 42 831).

Hints

Find the sum inside the brackets first.

2

STATEMENT: I am the final total after 125 740 is added to the sum of 532 765 and 42 831.

Hints

Complete the inner sum before the last addition.

3

STATEMENT: I am the subtotal formed by combining 220 105, 140 388 and 202 501 before another number is added.

Hints

There are three addends in this subtotal.

4

STATEMENT: I am the final total after 320 111 is added to the subtotal of 220 105, 140 388 and 202 501.

Hints

Solve the three-number subtotal first.

5

STATEMENT: I am the subtotal of 127 413 and 80 902, found before 310 607 is added.

Hints

Add the two smaller addends first.

6

STATEMENT: I am the final total of 310 607 + (127 413 + 80 902).

Hints

Use two stages of addition.

7

STATEMENT: I am the subtotal of 521 146 and 231 452 before 148 462 is added.

Hints

I am not the final answer; I am the inner sum.

8

STATEMENT: I am the final total after 148 462 is added to the sum of 521 146 and 231 452.

Hints

Find the inner sum, then add the outside number.

 
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