Activity 01
Simulation Game: Counting Back Relay
Divide class into teams. Call out subtraction problems like 10 - 3. First student counts back aloud from the start number, tags next teammate. Teams track correct answers on a board. Switch roles halfway.
How does counting back help us subtract small numbers?
Facilitation TipDuring Counting Back Relay, pause between rounds to ask students which counting back step felt the easiest and why.
What to look forPresent students with subtraction problems like 15 - 3, 40 - 10, and 12 - 5. Ask them to show the strategy they used (e.g., hold up fingers for counting back, draw a number bond) and state their answer.
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Activity 02
Number Bond Match-Up
Prepare cards with subtraction problems and matching number bond diagrams. In pairs, students draw a card, solve mentally using bonds, and find the matching card. Discuss strategies used for each match.
When is it easier to subtract tens first?
Facilitation TipFor Number Bond Match-Up, circulate and listen for students to name the missing part aloud as they pair cards.
What to look forGive each student a card with a subtraction problem, such as 18 - 6. Ask them to write down the answer and briefly describe the mental strategy they used to find it.
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Activity 03
Subtract Tens Toss
Use bean bags or soft balls numbered 10-50. Students toss to a number, then subtract 10 or 20 mentally and land on the result mat. Whole class cheers correct answers and shares thinking.
How do number bonds help us subtract mentally?
Facilitation TipIn Subtract Tens Toss, model how to say the total aloud as you toss, so students connect the physical action with the mental step.
What to look forPose a problem like 'Sarah had 17 stickers and gave 5 away. How many does she have left?' Ask students to share how they figured it out, encouraging them to explain if they counted back, used a number bond, or another strategy.
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Activity 04
Mental Math Circuit
Set up stations: counting back with number lines, tens subtraction with base-10 blocks, number bonds with part-whole mats. Small groups rotate, solving 5 problems per station before switching.
How does counting back help us subtract small numbers?
Facilitation TipDuring Mental Math Circuit, stand near the station with the highest error rate to offer immediate, quiet support.
What to look forPresent students with subtraction problems like 15 - 3, 40 - 10, and 12 - 5. Ask them to show the strategy they used (e.g., hold up fingers for counting back, draw a number bond) and state their answer.
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Generate Complete Lesson→A few notes on teaching this unit
Teach subtraction strategies one at a time, starting with counting back on a number line so students see the backward jump. Avoid rushing to abstract symbols; let students verbalize each step before writing it. Research shows that young learners benefit from seeing the same strategy practiced in different contexts before moving on.
Successful learning looks like students choosing efficient strategies with little hesitation, explaining their steps clearly, and applying methods flexibly across different problems. They should justify their answers using number lines, counters, or drawings rather than guessing.
Watch Out for These Misconceptions
During Counting Back Relay, watch for students who treat subtraction as addition by counting up from the smaller number.
Circle the larger number on the relay card and model counting back aloud, pointing to each step on the printed number line to redirect their thinking.
During Number Bond Match-Up, watch for students who claim number bonds only help with addition.
Place counters on a bond mat to show how 15 - 7 can be split into 10 - 7 first, then add the remaining 5, making the subtraction visible through the bond structure.
During Subtract Tens Toss, watch for students who always subtract ones before tens.
Ask them to solve the same problem two ways: once subtracting ones first and once tens first, then time both methods to show which is faster and less error-prone.
Methods used in this brief